Develop Reference

Center text over Image (and make responsive)?

In col-2, I am trying to center the "WHAT" text over the image.
<div class="row">
<div class="col-2">
<div class="stackParent">
<img class="stack-Img" src="img/base.png">
<div class="stack-Txt">
<div class="fourWsText stack-Txt-child">WHAT</div>
</div>
</div>
</div>
<div class="col-10">
...Variable length content...
</div>
</div>
As we resize the browser, the row height will change so that everything in col-10 fits. I am using object-fit:contain to keep the image proportions correct. I need the "stack-Txt" div to resize with the image so that the text will stay centered over the image
Or maybe you know of a better way to achieve this?
Current Idea:
Put WHAT in another child div, make flex, center text with justify-content/align-items
&
JS addEventListener to window resize, get the img div and set nextSibling size equal to this.
These were the css classes at some point... but the only important thing is that the img doesn't overflow the col-2 or the height (which is variable based on the length of col-10)
.stackParent {
position: relative;
object-fit: contain;
max-width: inherit;
height: 20vh;
}
.stack-Txt {
position: absolute;
text-align: center;
width: 100%;
max-height: 15vh;
min-height: 15vh;
z-index: 4;
}
.stack-Txt-child {
}
.stack-Img {
position: absolute;
object-fit: contain;
max-width: inherit;
min-height: 15vh;
max-height: 15vh;
top: 0%;
left: 0%;
z-index: 3;
}
*Note: I also have media queries to resize text, but this shouldn't make a difference.

If you are using Bootstrap 5 you can just use the built-in classes to achieve so.
Apply .position-relative to the main div parent
Apply .img-fluid to <img /> to make image responsive
Apply .position-absolute, .top-50, .start-50, translate-middle to stack-Txt to center it vertically and horizontally over the image.
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
<div class="row">
<div class="col-2">
<div class="stackParent position-relative">
<img class="stack-Img img-fluid" src="https://source.unsplash.com/random">
<div class="stack-Txt position-absolute top-50 start-50 translate-middle">
<div class="fourWsText stack-Txt-child text-white">WHAT</div>
</div>
</div>
</div>
<div class="col-10">
...Variable length content...
</div>
</div>
If you don't, just edit your CSS as follow:
.stackParent {
position: relative
}
/* make image responsive */
.stack-Img {
max-width: 100%;
height: auto;
}
.stack-Txt {
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
color: white;
}
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
<div class="row">
<div class="col-2">
<div class="stackParent">
<img class="stack-Img" src="https://source.unsplash.com/random">
<div class="stack-Txt">
<div class="fourWsText stack-Txt-child">WHAT</div>
</div>
</div>
</div>
<div class="col-10">
...Variable length content...
</div>
</div>

The text "what" is in center over the image in any screen resolution.
.stackParent{
display: flex;
width: 100%;
height: 100%;
align-items: center;
justify-content: center;
}
.stack-Img{
position: absolute;
margin: 0;
min-height: 15vh;
max-height: 15vh;
}
.stack-Txt{
z-index: 99;
}
<div class="row">
<div class="col-2">
<div class="stackParent">
<img class="stack-Img" src="img/base.png">
<div class="stack-Txt">
<div class="fourWsText stack-Txt-child">WHAT</div>
</div>
</div>
</div>
<div class="col-10">
...Variable length content...
</div>
</div>

Create a single img from tiled img

How can I create a single image from a tiled structure like this:
+-----+-----+-----+
|tile1|tile2|tile3|
+-----+-----+-----+
<div>
<div>
<img> tile 1
</div>
</div>
<div>
<div>
<img> tile 2
</div>
</div>
<div>
<div>
<img> tile 3
</div>
</div>
This is the detail:
<div style="position: absolute; left: -256px; top: -256px; width: 256px; height: 256px;">
<div style="position: absolute; left: 0px; top: 0px;">
<img src="tile1.png" style="width: 256px; height: 256px;">
</div>
</div>
<div style="position: absolute; left: 0px; top: -256px; width: 256px; height: 256px;">
<div style="position: absolute; left: 0px; top: 0px;">
<img src="tile2.png" style="width: 256px; height: 256px;">
</div>
</div>
....

You can simply make a canvas big enough to hold all of your images, then draw each image at the appropriate offset to replicate the same tiling effect that your HTML provides.
Or, if you really want to specifically capture the layout from your HTML, there's a package called html2canvas (https://html2canvas.hertzen.com/) which will do screen captures from any HTML, not just tiled images.

How to force the image to display given height and width without stretching in HTML DIV Tag?

I need some help to make the image fit inside the DIV Tag with provided height and width and should not stretch. As a few images are Landscape and a few are Portrait, I need to force them to fit into the DIV OR IMG Tag.
<div class="frame" style="">
<img id="photo" src="http://pocketlink.epocketlife.com/ImageRepository/images/events/ADEBAB1C-4FAF-4D65-A43D-A02978B76340/7adb104b-5140-45d9-a694-56cf5112917d.png">
</div>
This is one of the Examples I found, you may implement there.
http://jsbin.com/vikanovaya/edit?html,css,output

You will need to use some CSS position trickery to achieve what you want but hopefully one of these examples will do what you want.
Example 1 - A Single Image
In the example below, the image will grow or shrink when the image hits the edge of the container. If you resize the example horizontally or vertically it will never crop. (Try the fullscreen example for instance).
Requires: CSS Only
body {
margin: 0;
padding: 0;
font-family: "Segoe UI Light", "Helvetica Neue LT", "Helvetica Ultra LT", "Roboto", Arial, sans-serif;
}
.gallery {
background: rgba(0, 0, 0, 0.9);
border-radius: 10px;
position: absolute;
top: 20px;
bottom: 20px;
left: 20px;
right: 20px;
overflow: hidden;
z-index: 2;
}
.gallery .imageWrapper {
position: absolute;
right: 0;
left: 0;
top: 0;
bottom: 0;
}
.gallery .imageWrapper img {
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
margin: auto;
max-width: 100%;
max-height: 100%;
}
<div class="gallery isFullScreen">
<div class="imageWrapper">
<img src="http://via.placeholder.com/3500x1500" />
</div>
</div>
Example 2 - Thumbnails
In this example there are two images that don't conform to their containers aspect ratio. They are resized so that their longest edge hits the div first and then they are centered. All thumbnail containers should now be the same size and images that do not conform shrink to fit.
Requires: CSS Only
.galleryArea {
background: rgba(0,0,0,0.7);
padding: 10px;
overflow: hidden;
}
.galleryArea .imageWrapper {
position: relative;
width: 100px;
height: 100px;
float: left;
background: #fff;
}
.galleryArea .imagePosition {
position: absolute;
top:0;
bottom: 0;
left: 0;
right: 0;
}
.galleryArea .imagePosition img {
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
margin: auto;
max-width: 100%;
max-height: 100%;
}
<div id="contentGallery" class="galleryArea">
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/150x400" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x100" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
</div>
Example 3 - Thumbnails that Stretch
In this example, the two images that do not conform to their containers aspect ratios are now stretched so that their shortest edge expands to fill the container and their longest edge overflows. This makes the end result a little neater but requires JavaScript to help things along.
Requires: CSS and JavaScript (jQuery)
$(window).on("load", function() {
orientateGalleryImages($("#contentGallery").children().children().children("img"));
});
function orientateGalleryImages(images) {
images.each(function() {
var thisImage = jQuery(this);
if(thisImage.height() > thisImage.width()) {
thisImage.addClass("portrait");
} else if(thisImage.width() > thisImage.height()) {
thisImage.addClass("landscape");
} else {
thisImage.addClass("square");
}
});
}
.galleryArea {
background: rgba(0,0,0,0.7);
padding: 10px;
display: flex;
}
.galleryArea .imageWrapper {
position: relative;
width: 10%;
padding-top: 10%;
overflow: hidden;
}
.galleryArea .imagePosition {
position: absolute;
top: -50%;
left: -50%;
width: 200%;
height: 200%;
}
.galleryArea .imagePosition img {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
margin: auto;
}
.galleryArea .imagePosition img.landscape {
max-height: 50%;
height: 50%;
left: -50%;
margin-left: 25%;
}
.galleryArea .imagePosition img.portrait {
max-width: 50%;
width: 50%;
}
.galleryArea .imagePosition img.square {
max-width: 50%;
max-height: 50%;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="contentGallery" class="galleryArea">
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/150x400" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x100" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
<div class="imageWrapper">
<div class="imagePosition">
<img src="http://placehold.it/300x300" />
</div>
</div>
</div>

How to put four images 2x2 on other image as background, CSS?

I try to put 4 images (same size) on 5th image defined as BG.
This is how it looks like now:
It works fine if height is fixed but in my case the height might change and I get this behavior:
This issue is not surprises me because I use % but not px.
When width changes, the style left: 13% changes
Very important!!! I can use only "%"
How can I achieve 1st image I posted even if height changes?
Here is relevant code:
<!-- BG image -->
<div style="position: relative; right: 0; top: 0; height:100%">
<img src="img/groups/pic-shade.png" style="
position: relative;
top: 0%;
right: 0%;
height: 17.6%;
">
<!-- left-top image -->
<img
style="position: absolute;
height: 42.25%;
top: 0%;
left: 0%;" src="img/group_6.png">
<!-- right-top image -->
<img
style="position: absolute;
height: 42.25%;
top: 0%;
left: 13%;" src="img/group_6.png">
<!-- left-bottom image -->
<img
style="position: absolute;
height: 42.25%;
bottom: 0%;
left: 0%;" src="img/group_6.png">
<!-- right-bottom image -->
<img
style="position: absolute;
height: 42.25%;
bottom: 0%;
left: 13%;" src="img/group_6.png">
</div>
[EDIT]
I tried to put right: 0% instead left: 13% but it doesn't help me because BG div has bigger width then BG image:
Here is root DIV selected:

DEMO
Don't use position absolute -- it breaks the flow and relationship between elements which means they can not show any response to each others width height changes.
Instead use the table technique -- check the demo.
HTML
<div class="bg-image-wrapper">
<div class="table">
<div class="row">
<div class="cell"><img src="http://placehold.it/100x100" alt="" /></div>
<div class="cell"><img src="http://placehold.it/100x100" alt="" /></div>
</div>
<div class="row">
<div class="cell"><img src="http://placehold.it/100x100" alt="" /></div>
<div class="cell"><img src="http://placehold.it/100x100" alt="" /></div>
</div>
</div>
</div>
CSS
img{
display:block;
}
.table{
display: table;
}
.row{
display: table-rwo;
}
.cell{
display:table-cell;
}
.bg-image-wrapper{
display: inline-block;
background: url(http://placehold.it/200x200);
border-radius: 10px;
overflow: hidden;
}

<!-- BG image -->
<div style="background-image:url("img/groups/pic-shade.png"); position: relative; right: 0; top: 0; height:100%">
<table>
<tr>
<td>
<img style="height: 100%;width: 100%;src="img/group_6.png">
</td>
<td>
<img style="height: 100%;width: 100%;src="img/group_6.png">
</td>
</tr>
<tr>
<td>
<img style="height: 100%;width: 100%;src="img/group_6.png">
</td>
<td>
<img style="height: 100%;width: 100%;src="img/group_6.png">
</td>
</tr>
</div>

-webkit-transform (rotateX) causes z-index to be ignored, affecting a button in separate div

SOLVED:
After re-reading the w3 spec for transforms, I realised the footer was being considered part of the 3d context due to DOM structure and was being affected by rotated elements. I simply put .cardsContainer inside of another element .cards3dContainer and the footer is now not considered part of the 3d context.
-webkit-perspective:1000px; seems to state that the 3d context begins at that point in the DOM.
Having a major problem with a container that is being rotated using css3 transforms and over-writing part of a buttons hit area in another div.
The transform visually works and the container is leaning back (using rotateX). However, the button in the footer, despite being of a higher z-index and naturally stacked to be above the container, is having its hit area ignored where the rotated container and the button visually overlap. The button still 'appears' to be on top of the rotated container, but acts like it is under it.
I should mention im using Less for the css (and all the Less code does work).
I've looked through lots of similar questions and the various solutions didn't work for me. Amongst those that didn't work (vendor prefixes omitted):
translate3d(0px, 0px, 0px);
transform-style: flat;
Here is the short version of the code:
html:
<div class="screen snap" style="display: block;">
<div class="container">**<!-- has perspective set to 1000 -->**
<div class="cardsContainer"> **<!-- is rotated on x using transform -->**
<div class="card" style="left: 130px; display: block;">
<div class="cardBack"></div>
<div class="cardFront" style="opacity: 0;">
<div class="cardContent">A piece of fruit.</div>
</div>
</div>
</div>
<footer>
**<!-- at certain screen sizes, when the container and footer overlap, top half of this buttons hit area is inactive-->**
<button class="checkButton">Start</button>
</footer>
</div>
</div>
Here are the full length files, look forward to any advice / tips:
.html file:
<div class="screen snap" style="display: block;">
<div class="container">
<div class="cardsContainer">
<div class="card" style="left: 130px; display: block;">
<div class="cardBack"></div>
<div class="cardFront" style="opacity: 0;">
<div class="cardContent">A piece of fruit.</div>
</div>
</div>
<div class="card" style="left: 420px; display: block;">
<div class="cardBack"></div>
<div class="cardFront" style="opacity: 0;">
<div class="cardContent">Paint</div>
</div>
</div>
<div class="card" style="left: 420px; display: none;">
<div class="cardBack"></div>
<div class="cardFront">
<div class="cardContent">Nail</div>
</div>
</div>
<div class="card" style="left: 420px; display: none;">
<div class="cardBack"></div>
<div class="cardFront">
<div class="cardContent">Apple</div>
</div>
</div>
<div class="card" style="left: 420px; display: none;">
<div class="cardBack"></div>
<div class="cardFront">
<div class="cardContent">House</div>
</div>
</div>
</div>
<footer>
<button class="checkButton">Start</button>
</footer>
</div>
</div>
.less file:
.screen.snap .container{
padding: 0;
margin: 0;
border: 0;
left: 0;
right: 0;
bottom: 0;
top: 0;
border-radius: 0;
box-shadow: none;
vertical-align: baseline;
background-color: #efe8b6;
-webkit-perspective:1000px;
.cardsContainer{
position:absolute;
width:800px;
height:350px;
top:100px;
text-align: center;
background-color: lighten(#efe8b6, 10%);
-webkit-transform: rotateX(20deg);
.card {
position: absolute;
width:250px;
height:350px;
border-radius: 10px;
.cardFront{
background-image: url('images/snap_card_front.png');
background-repeat: no-repeat;
width:250px;
height:350px;
position: absolute;
.cardContent{
width:200px;
height:300px;
font-size: 37px;
}
}
.cardBack{
background-image: url('images/snap_card_back.png');
background-repeat: no-repeat;
width:250px;
height:350px;
position: absolute;
}
}
}
}
footer{
z-index:999;
background-color: #f00;
position: relative;
.button{
position:absolute;
width:50px;
height:50px;
background-color: #ccc;
border-radius: 5px;
font-size: 25px;
cursor: pointer;
}
}

After re-reading the w3 spec for transforms, I realised what the problem was.
-webkit-perspective:1000px; seems to state that the 3d context begins at that point in the DOM. I was applying the perspective style to the container which both the footer and the cardsContainer were part of. The footer was then being considered part of the 3d context due to DOM structure and was being affected by rotated elements.
I simply put .cardsContainer inside of another element .cards3dContainer and the footer is now not considered part of the 3d context because it is now not inside the dom structure which has perspective style set.
The new structure is now this:
.screen.snap .container{
.cards3dContainer{
-webkit-perspective:1000px;
.cardsContainer{
}
}
.footer{
}
}
Apologies to anyone who may have been working on an answer at the moment.