Responsive scaling not working

Responsive scaling not working - javascript

I'm working on a short one-page site with a rotating set of pix. Somehow the js script and images are breaking the site's ability to scale down. I'm not an experienced coder, so I'm flailing a bit.
I'm pretty sure it's to do with some of the fixed widths in the CSS, but removing them creates even more trouble. Any help tracking down the cause would be much appreciated. Here's a Codepen link to the problem.
HTML:
<html>
<head>
<title></title>
<meta charset="utf-8" />
<meta http-equiv="Content-type" content="text/html" ; charset="utf-8" />
<meta name="created" content="Fri, 22 Jan 2016 17:43:40 GMT" />
<meta name="description" content="" />
<meta name="keywords" content="" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link href="jvs_style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="wrap">
<div class="maingrid">
<div class="slides">
<img src="http://tests.markgarvey.com/slideshow_images/out1.png" max-width:100%;>
<img src="http://tests.markgarvey.com/slideshow_images/out2.png" max-width:100%;>
<img src="http://tests.markgarvey.com/slideshow_images/out3.png">
<img src="http://tests.markgarvey.com/slideshow_images/out4.png">
<img src="http://tests.markgarvey.com/slideshow_images/out5.png">
<img src="http://tests.markgarvey.com/slideshow_images/out6.png">
<img src="http://tests.markgarvey.com/slideshow_images/out7.png">
<img src="http://tests.markgarvey.com/slideshow_images/out8.png">
<img src="http://tests.markgarvey.com/slideshow_images/out9.png">
<img src="http://tests.markgarvey.com/slideshow_images/out10.png">
</div>
<!-- end of slides div -->
<div class="centertext">
<img src="http://tests.markgarvey.com/images/JVSA_weblogo3.png" width="281" height="106" alt="" title="" border="0" />
<p class="name">FIRSTNAME LASTNAME</p>
<p class="address">1234 Example Street<br> Princeton, New Jersey 12345<br> testing#email.net
<br> 505.422.6563
</p>
<p>Solemnly he came forward and mounted the round gunrest. He faced about and blessed gravely thrice the tower, the surrounding country and the awaking mountains. Then, catching sight of Stephen Dedalus, he bent towards him and made rapid crosses
in the air, gurgling in his throat and shaking his head. Stephen Dedalus, displeased and sleepy, leaned his arms on the top of the staircase and looked coldly at the shaking gurgling face that blessed him, equine in its length, and at the light
untonsured hair, grained and hued like pale oak.
</p>
</div>
<!-- end of centertext div -->
</div>
<!-- end of maingrid div -->
</div>
<!-- end of wrap div -->
<script>
function nextSlide() {
var q = function(sel) {
return document.querySelector(sel);
}
q(".slides").appendChild(q(".slides img:first-child"));
}
setInterval(nextSlide, 5000)
</script>
</body>
</html>
CSS:
#wrap {
max-width: 100%;
width: 1000px;
background: #FFF;
margin: 0 auto;
}
.maingrid {
display: grid;
grid-template-columns: 1fr;
grid-template-rows: 1fr;
align-items: center;
justify-items: center;
margin-top: 50px;
}
.centertext {
align-self: center;
justify-self: center;
margin-top: 20px;
display: block;
position: relative;
margin-left: auto;
margin-right: auto;
text-align: left;
letter-spacing: normal;
line-height: 19px;
padding-bottom: 5px;
font-family: Verdana, Arial, sans-serif;
color: #000000;
font-size: 1em;
line-height: 20px;
}
img {
max-width: 100%;
height: auto;
}
.name {
font-size: 1.5em;
font-weight: bold;
font-variant: small-caps;
margin-bottom: 5px;
}
.address {
margin-top: 8px;
line-height: 24px;
font-family: Arial, sans-serif;
color: #000000;
font-size: 1em;
line-height: 19px;
}
/* the slide container with a fixed size */
.slides {
max-width: 100%;
width: 1000px;
height: 670px;
position: relative;
}
/* the images are positioned absolutely to stack. opacity transitions are animated. */
.slides img {
height: auto;
display: block;
position: absolute;
transition: opacity 1s;
opacity: 0;
max-width: 100%;
width: 1000px;
margin-bottom: 60px;
}
/* the first image is the current slide. it's faded in. */
.slides img:first-child {
z-index: 2;
/* frontmost */
opacity: 1;
}
/* the last image is the previous slide. it's behind the current slide and it's faded over. */
.slides img:last-child {
z-index: 1;
/* behind current slide */
opacity: 1;
}
Thanks for any help.

Your fixed widths (of 1000px) are to blame.
Try:
.slides {
width:100%;
max-width: 1000px;
height: 670px;
position: relative;
}
/* the images are positioned absolutely to stack. opacity transitions are animated. */
.slides img {
height: auto;
display: block;
position: absolute;
transition: opacity 1s;
opacity: 0;
width:100%;
max-width: 1000px;
margin-bottom:60px;
}
Here is an edited codepen.

Related

How do I prevent elements with absolute position from overflowing?

I have attached a simple code snippet for a website. When hovering over the underlined words, images are supposed to appear. How can I prevent those images from "jumping out" of their container so that they will always be visible and don't leave the screen?
The images are supposed to appear at the position of the correlating word.
I hope you understand the problem I've described here.
#charset "UTF-8";
/* CSS Document */
html, body {
margin: 0;
background-color: black;
}
#wrapper {
margin: 0;
position: fixed;
width: 100%;
height: 100%;
overflow: scroll;
}
.section {
width: 100%;
height: 100%;
display: flex;
flex-direction: column;
align-content: center;
align-items: center;
justify-content: center;
text-align: left;
position: relative;
}
p {
color: white;
font-family: Helvetica, sans-serif;
font-size: 36px;
margin-left: 100px;
margin-right: 100px;
text-align: left;
display: block;
width: 50%;
}
.gallery-image {
position: absolute;
display: none;
transform: translate(0,calc(1em - 50%));
max-width: 50vw;
max-height: 75vh;
height: auto;
z-index: 1000;
}
.gallery-link {
position: relative;
text-decoration: underline;
}
.gallery-link:hover > .gallery-image{
display: flex;
z-index: 1000;
}
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<link href="styles.css" rel="stylesheet" type="text/css">
</head>
<body>
<div id="wrapper">
<div class="section">
<p>Title<br>
Nor is there anyone who loves or pursues or desires to obtain pain of itself, because it is pain
<span class="gallery-link"><img class="gallery-image" src="https://upload.wikimedia.org/wikipedia/commons/a/a0/590_Madison_Ave_IBM_08.jpg" >
vulnerability </span> of any.<br>
The once <span class="gallery-link">colorful rug<img class="gallery-image" src="https://upload.wikimedia.org/wikipedia/commons/thumb/7/7c/Ornamentglas_B_-_Ansicht_1.jpg/1000px-Ornamentglas_B_-_Ansicht_1.jpg"></span> has been <span class="gallery-link">broken down<img class="gallery-image" src="https://upload.wikimedia.org/wikipedia/commons/4/4a/CocooningⓒShin%2C_Kyungsub.jpg" ></span> but is there anyone who loves or pursues or desires to obtain pain of itself, because it is pain.<br>
End Quote
</p>
</div>
</div>
</body>
</html>

You can try to modify your .gallery-image with top and remove transform too. Your final CSS will be like this
.gallery-image {
position: absolute;
display: none;
max-width: 50vw;
max-height: 75vh;
height: auto;
z-index: 1000;
top: 100%; /*Here is the main change*/
}
You can check the sandbox here https://jsfiddle.net/kqoh2Lat/
The final result

Navbar is not hiding on scroll using javascript

I'm struggling to hide the navbar on scroll down. I know how to do it, but just because of some silly mistake I'm unable to do so, and can't figure out what the issue is.
Here's the html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css">
<title>Document</title>
</head>
<body>
<div id="navbar">
<div id="logo">
<a href="#">
<h1>My logo</h1>
</a>
</div>
<ul id="menu">
<li><a class="link-button" href="#">HOME</a></li>
<li><a class="link-button" href="#">ARTICLES</a></li>
<li><a class="link-button" href="#">PROJECTS</a></li>
<li><a class="link-button" href="#">AUTHOR</a></li>
<li><a class="link-button" href="#">CONTACT</a></li>
</ul>
</div>
<div id="welcome">
<h1 id="welcome-text">My Portfolio</h1>
</div>
<div class="container">
</div>
<!-- Here script for hidding navbar on scroll down -->
<script>
window.addEventListener("scroll", function(){
let Navbar = document.getElementById('navbar');
if(window.pageYOffset > 0){
Navbar.classList.add("navbar-scroll");
}else{
Navbar.classList.remove("navbar-scroll");
}
});
</script>
</body>
</html>
And here's the full css
*{
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: sans-serif;
}
body{
height: 100vh;
perspective: 1px;
transform-style: preserve-3d;
overflow-x: hidden;
overflow-y: auto;
}
html{
overflow: hidden;
}
#navbar{
position: sticky;
width: 100%;
top: 0;
transition: background 0.5s;
background-color: transparent;
z-index: 2;
}
#navbar #logo{
float: left;
margin: 10px;
}
#navbar #logo a{
font-size: 155%;
color: #ffffff;
text-decoration: none;
}
#navbar ul{
float: right;
justify-content: space-around;
list-style: none;
align-items: center;
padding: 20px;
}
#navbar ul li{
display: inline-block;
}
/* === Here I'm changing the display property of the navbar to none to make it disappear. === */
#navbar.navbar-scroll{
display: none;
}
.link-button{
display: block;
text-align: center;
margin: 0 15px;
font-size: 89%;
color: #ffffff;
text-decoration: none;
}
.link-button::after{
content: '';
display: block;
width: 0;
height: 2px;
margin-top: 2px;
background: #ffffff;
transition: width .3s;
}
.link-button:hover::after{
width: 100%;
transition: width .3s;
}
#welcome{
height: 100vh;
width: 100vw;
box-sizing: border-box;
}
#welcome::before{
content: "";
height: 100vh;
width: 100vw;
top: 0;
left: 0;
background: linear-gradient(#0000008e, #0000008e), url('static/bc22.jpg');
background-position: center;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
position: absolute;
z-index: -1;
transform: translateZ(-2px) scale(3);
}
#welcome-text{
color: #ffffff;
position: absolute;
top: 50%;
left: 26%;
transform: translate(-50%, -50%);
/* text-align: center; */
font-size: 600%;
}
.container{
background-color: #1f1f1f;
height: 1000px;
}
In the CSS I've also tried changing the background colour of the navbar on scroll (in the #navbar.navbar-scroll), but it ain't working as well. So most probably the error is in the javascript I think.
If there's a better way of hiding the navbar on scroll then that's welcomed as well.
Thanks for your time.

Actually the problem lies under your HTML overflow: hidden;. So when you set your HTML overflow to hidden, the window.addEventListener("scroll", function () {}) will never invoke, because window will never scroll at all. So to fix this you should either remove html{overflow: hidden;} from your styles or add your event listener to listen to your body element instead, which is not recommended.

From your CSS, it seems your goal is to have the body as the scroll container and not <HTML> itself.
Something like this should work as your JavaScript:
document.body.addEventListener("scroll", function(){
let Navbar = document.getElementById('navbar');
if(document.body.scrollTop > 0){
Navbar.classList.add("navbar-scroll");
}else{
Navbar.classList.remove("navbar-scroll");
}
});
Pretty much every tag which can have children can be scrollable if you define it in your CSS. That means you will have to listen to the right element in JS too.

Hover image size issue

I used hover images but when I opened it on small screen {400px, 969px } those images are overflowing, it's not fit with devices. I tried with x overflow but its chopping the image. I need those images to fit all devices with
*, *::before, *::after{
-moz-box-sizing: border-box;
box-sizing: border-box;
-webkit-transition: all 0.3s ease-in-out;
transition: all 0.3s ease-in-out;
}
.hero2 container{
width: 100%;
max-width: 100%;
margin: auto;
display: block;
text-align: center;
position: absolute;
top: 0; left: 0;
}
figure{
width: 400px;
height: 300px;
overflow: hidden;
position: relative;
display: inline-block;
vertical-align: top;
border: 5px solid #fff;
box-shadow: 0 0 5px #ddd;
margin: auto;
}
figcaption{
position: absolute;
left: 0; right: 0;
top: 0; bottom: 0;
text-align: center;
font-weight: bold;
width: 100%;
height: 100%;
display: table;
}
figcaption div{
display: table-cell;
vertical-align: middle;
position: relative;
top: 20px;
opacity: 0;
color: #2c3e50;
text-transform: uppercase;
}
figcaption div:after{
position: absolute;
content: "";
left: 0; right: 0;
bottom: 40%;
text-align: center;
margin: auto;
width: 0%;
height: 2px;
background: #2c3e50;
}
figure img{
flex: auto;
float:left;
margin-right: 2px;
position: relative;
-webkit-transition: all 0.5s linear;
transition: all 0.5s linear;
-webkit-transform: scale3d(1, 1, 1);
transform: scale3d(1, 1, 1);
width: 100%;
}
figure:hover figcaption{
background: rgba(255,255,255,0.3);
}
figcaption:hover div{
opacity: 1;
top: 0;
}
figcaption:hover div:after{
width: 50%;
}
figure:hover img{
-webkit-transform: scale3d(1.2, 1.2, 1);
transform: scale3d(1.2, 1.2, 1);
}
.grid {
position: relative;
margin: 0 auto;
padding: 1em 0 4em;
max-width: 1000px;
list-style: none;
text-align: center;
}
/*font-face*/
#font-face {
font-family: 'Lato';
font-style: normal;
font-weight: 100;
src: local('Lato Hairline'), local('Lato-Hairline'), url(http://themes.googleusercontent.com/static/fonts/lato/v6/boeCNmOCCh-EWFLSfVffDg.woff) format('woff');
}
#font-face {
font-family: 'Lato';
font-style: normal;
font-weight: 300;
src: local('Lato Light'), local('Lato-Light'), url(http://themes.googleusercontent.com/static/fonts/lato/v6/KT3KS9Aol4WfR6Vas8kNcg.woff) format('woff');
}
#font-face {
font-family: 'Lato';
font-style: normal;
font-weight: 400;
src: local('Lato Regular'), local('Lato-Regular'), url(http://themes.googleusercontent.com/static/fonts/lato/v6/9k-RPmcnxYEPm8CNFsH2gg.woff) format('woff');
}
#font-face {
font-family: 'Lato';
font-style: normal;
font-weight: 700;
src: local('Lato Bold'), local('Lato-Bold'), url(http://themes.googleusercontent.com/static/fonts/lato/v6/wkfQbvfT_02e2IWO3yYueQ.woff) format('woff');
}
.hero2 p {
font-size: 50;
}
.hero2 row content container{
width: 100%;
max-width: 900px;
margin: 0 auto;
position: relative;
padding: 0 0%;
flex: auto;
}
<link href='https://fonts.googleapis.com/css?family=Raleway:400,800,300' rel='stylesheet' type='text/css'>
<link href="test1.css" rel="stylesheet"type="text/css">
<div class="hero2">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="X-UA-Compatible"content="ie=edge">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<body>
<div class="row content">
<p> Projects </p>
<div class="container">
<figure>
<img src="online%20shoping.jpg" alt="Thumb"width="300" height=" 300" />
<figcaption><div> Online shoping site <br> Technology: Java , SQL <br>
Web-based online shopping application . It maintains the details of customer payments, product receipts, products and also updating, deletion for the same. It also stores the details of invoices generated by customer and payments details. The primary features of the project are high accuracy, design flexibility and easy availability. </div></figcaption>
</figure>
<figure>
<img src="hexapod.jpg" alt="Thumb" width="300" height=" 300" />
<figcaption><div> Hexapod Robot <br>Technology: Embedded This project develops a Hexapod robot used to explore a remote location by sensing the parameters like light, temperature, distance etc, processes it and transmits the collected data to the control station using wireless means. Here Wi-Fi technology was used, real time video capturing facility. </div></figcaption>
</figure>
<figure>
<img src="per.JPG" alt="Thumb" width="300" height=" 300"/>
<figcaption><div> dipuraj.com- Personal website </div></figcaption>
</figure>
<figure>
<img src="autonom.jpg" alt="Thumb" width="300" height=" 300" />
<figcaption><div>Machine learning project Technology: JAVA, SQL <br>
Getting the true data and after making real time examples it will be used to teach the machine , how to react with situations occurring around it. For getting the perfect output we analysed it through several stages after the development. </div></figcaption>
</figure>
</div></div>
</body>
</div>
screen shoot hover effect[output what I got what I am expecting in all screen (small mobile device below 400 res)
hope that I will get a solution from someone

You have not used media query to fit in different device , Since you have followed the same css for all the device you should not specify the width and height for figure instead try using max-width and max-height
figure{
max-width: 400px; /* Corrected css */
max-height: 300px;
}
If you specify width in all device the given width will be applied unless you have written media query to apply different width for different devives.

Please remove the width and height given to the tag inside your html and specify it through css to maintain the height and width of the image to fit the parent.

It will Help you try to define your width and height of window like
window.innerWidth;
window.innerHeight;
In java script and set your image size width and height with %.
For more help W3schools.

Try this,
change figure width:400px; into width:100%;
figure{
width:100%;
}

I have used media query with calculation for width now you can check. when your device width is less than 600 you will get full view of your image for device width above 600 you will see two split of your image panel.
*, *::before, *::after{
-moz-box-sizing: border-box;
box-sizing: border-box;
-webkit-transition: all 0.3s ease-in-out;
transition: all 0.3s ease-in-out;
}
.hero2 container{
width: 100%;
max-width: 100%;
margin: auto;
display: block;
text-align: center;
position: absolute;
top: 0; left: 0;
}
figure{
width: calc(50% - 5px);
height: 300px;
overflow: hidden;
position: relative;
display: inline-block;
vertical-align: top;
border: 5px solid #fff;
box-shadow: 0 0 5px #ddd;
margin: auto;
}
#media only screen and (max-width: 600px) {
figure{
width: calc(100% - 5px);
height: 300px;
}
}
figcaption{
position: absolute;
left: 0; right: 0;
top: 0; bottom: 0;
text-align: center;
font-weight: bold;
width: 100%;
height: 100%;
display: table;
}
figcaption div{
display: table-cell;
vertical-align: middle;
position: relative;
top: 20px;
opacity: 0;
color: #2c3e50;
text-transform: uppercase;
}
figcaption div:after{
position: absolute;
content: "";
left: 0; right: 0;
bottom: 40%;
text-align: center;
margin: auto;
width: 0%;
height: 2px;
background: #2c3e50;
}
figure img{
flex: auto;
float:left;
margin-right: 2px;
position: relative;
-webkit-transition: all 0.5s linear;
transition: all 0.5s linear;
-webkit-transform: scale3d(1, 1, 1);
transform: scale3d(1, 1, 1);
width: 100%;
}
figure:hover figcaption{
background: rgba(255,255,255,0.3);
}
figcaption:hover div{
opacity: 1;
top: 0;
}
figcaption:hover div:after{
width: 50%;
}
figure:hover img{
-webkit-transform: scale3d(1.2, 1.2, 1);
transform: scale3d(1.2, 1.2, 1);
}
.grid {
position: relative;
margin: 0 auto;
padding: 1em 0 4em;
max-width: 1000px;
list-style: none;
text-align: center;
}
/*font-face*/
#font-face {
font-family: 'Lato';
font-style: normal;
font-weight: 100;
src: local('Lato Hairline'), local('Lato-Hairline'), url(http://themes.googleusercontent.com/static/fonts/lato/v6/boeCNmOCCh-EWFLSfVffDg.woff) format('woff');
}
#font-face {
font-family: 'Lato';
font-style: normal;
font-weight: 300;
src: local('Lato Light'), local('Lato-Light'), url(http://themes.googleusercontent.com/static/fonts/lato/v6/KT3KS9Aol4WfR6Vas8kNcg.woff) format('woff');
}
#font-face {
font-family: 'Lato';
font-style: normal;
font-weight: 400;
src: local('Lato Regular'), local('Lato-Regular'), url(http://themes.googleusercontent.com/static/fonts/lato/v6/9k-RPmcnxYEPm8CNFsH2gg.woff) format('woff');
}
#font-face {
font-family: 'Lato';
font-style: normal;
font-weight: 700;
src: local('Lato Bold'), local('Lato-Bold'), url(http://themes.googleusercontent.com/static/fonts/lato/v6/wkfQbvfT_02e2IWO3yYueQ.woff) format('woff');
}
.hero2 p
{
font-size: 50;
}
.hero2 row content container{
width: 100%;
max-width: 900px;
margin: 0 auto;
position: relative;
padding: 0 0%;
flex: auto;
}
<link href='https://fonts.googleapis.com/css?family=Raleway:400,800,300' rel='stylesheet' type='text/css'>
<link href="test1.css" rel="stylesheet"type="text/css">
<div class="hero2">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="X-UA-Compatible"content="ie=edge">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<body>
<div class="row content">
<p> Projects </p>
<div class="container">
<figure>
<img src="online%20shoping.jpg" alt="Thumb" />
<figcaption><div> Online shoping site <br> Technology: Java , SQL <br>
Web-based online shopping application . It maintains the details of customer payments, product receipts, products and also updating, deletion for the same. It also stores the details of invoices generated by customer and payments details. The primary features of the project are high accuracy, design flexibility and easy availability. </div></figcaption>
</figure>
<figure>
<img src="hexapod.jpg" alt="Thumb" />
<figcaption><div> Hexapod Robot <br>Technology: Embedded This project develops a Hexapod robot used to explore a remote location by sensing the parameters like light, temperature, distance etc, processes it and transmits the collected data to the control station using wireless means. Here Wi-Fi technology was used, real time video capturing facility. </div></figcaption>
</figure>
<figure>
<img src="per.JPG" alt="Thumb" />
<figcaption><div> dipuraj.com- Personal website </div></figcaption>
</figure>
<figure>
<img src="autonom.jpg" alt="Thumb" />
<figcaption><div>Machine learning project Technology: JAVA, SQL <br>
Getting the true data and after making real time examples it will be used to teach the machine , how to react with situations occurring around it. For getting the perfect output we analysed it through several stages after the development. </div></figcaption>
</figure>
</div></div>
</body>
</div>

How to create a div that scrolls to the bottom and then stays fixed

I am making a page with two main parts, div a on the left half of the screen which will have text, and div b on the right half which will have a really tall image.
Originally, I imagined having the left side fixed so that when the user scrolls down to see the entire image, the text on the left stays visible.
However, I realized sometimes the text may overflow beyond the screen, and the fixed div would not scroll down to show it.
Below is the image of what I'm talking about:
My question is: can I make the left div scroll down until the bottom of the div is revealed, and then stays fixed as the user continues to scroll?
If that didn't make sense, an example is the right bar of the Facebook main page at
https://www.facebook.com
Here is the code I have so far: https://pastebin.com/ZPVEbjX9
html,
body {
padding: 0;
margin: 0;
background-color: #FFF;
color: #000;
display: flex;
font-family: Montserrat;
}
div#a {
position: fixed;
width: 40%;
height: 100%;
}
div#box {
position: absolute;
width: 70%;
height: 100%;
margin: auto 0;
background-color: #FFFAAA;
}
div#b {
position: relative;
width: 60%;
height: 100%;
margin-left: 40%;
background-color: #000;
}
div#backToTop {
position: fixed;
width: auto;
height: 30px;
right: 20px;
bottom: 20px;
background-color: rgba(0, 0, 0, 0.4);
border-radius: 5px;
}
a#backToTop {
text-decoration: none;
font-size: 15px;
color: #FFF;
padding: 10px;
vertical-align: middle;
line-height: 30px;
}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link type="text/css" rel="stylesheet" href="stylesBig.css" media="screen">
<link href="https://fonts.googleapis.com/css?family=Montserrat:100,100i,200,200i,300,300i,400,400i,500,500i,600,600i,700,700i,800,800i,900,900i" rel="stylesheet">
<title>G</title>
</head>
<body>
<a name="top"></a>
<div id="a">
<div id="box">
<p>a</p>
</div>
</div>
<div id="b">
<img src="image.png" style="width: 100%;" />
<div id="backToTop"><a id="backToTop" href="#top">back to top</a></div>
</div>
</body>
</html>
What am I doing wrong and how can I fix it?

Center html content with css

I'm building an WIP placeholder page for myself and I'm stuck with centering the media content with CSS. I managed to get it to work on mobile but the content is slightly to the right on desktop.
UPDATE:
I've added the entire code along with the CSS I selected to support it. As you can tell, the .display section of the CSS is where I'm having the most trouble (assuming I've troubleshot this right). From what I've been told here & read elsewhere, the tags I initially tried in HTML don't apply to HTML5 so I'm hoping to get CSS to finish it off. Like I mentioned before, when previewing on mobile, it works fine and the links at the bottom of the page stack nicely but it all falls apart in full desktop.
Here's the code below:
#charset "utf-8";
/* CSS Document */
.content {
max-width: 500px;
margin: auto;
}
.display{
position:relative;
display: block;
padding: 0;
margin:0 auto;
width: auto;
text-align:center;
display:flex;
justify-content:center;
}
.button {
background-color: #FFFFFF;
border: #000000;
border-bottom-width: 2px;
text-decoration-color: #FFFFFF;
padding: 15px 32px;
text-align: center;
display: inline-block;
font-size: 16px;
}
.help-block.with-errors {
color: #ff0000;
margin-top: 5px;
}
.overlay {
position:fixed;
top:0;
left:0;
right:0;
bottom:0;
background-color:rgba(0, 0, 0, 0.8);
z-index:100;
color:white;
display: none;
font-family: 'source_sans_proregular';
line-height: 25px;
-webkit-text-size-adjust:none;
text-size-adjust:none;
}
.container {
width:100%;
height:100%;
margin:0;
padding:0;
border:0;
}
.container td {
vertical-align: middle;
text-align: center;
}
.centerAlign {
text-align: center;
}
.margin2x {
margin-bottom: 24px;
}
.margin1x {
margin-bottom: 12px;
}
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>mAdjetey is getting an upgrade</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="index_files/mine.css" rel="stylesheet" type="text/css">
<link rel="shortcut icon" href="index_files/favicon.png">
</head>
<a name="tepin"></a>
<div class="display" align="center">
<img src="index_files/uc_main.png" style="max-width:100%" height="auto" alt="Website under redesign">
</div>
<div class="display">
<div class="w3-topbar">
<img src="index_files/icon_email.png" alt="Email">
</div>
</div>
<div class="display" align="center">
Back to top of page
</div>
</html>

theres several ways but in this example I'm applying "display: block" to the image so that it can use the margin property.
/* CSS */
.display img {
display: block;
padding: 0;
/* maybe some top margin too? margin: 30% auto 0 */
margin: 0 auto;
width: auto;
}
<!-- HTML -->
<div class="display" align="center">
<img src="index_files/uc_main.png" style="max-width:100%" height="auto" alt="Website under redesign">
</div>

The align attribute is not supported in HTML5. Use CSS instead.
.className{
text-align:center
}
Or you can always use display flex
.className{
display:flex;
justify-content:center
}

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