Develop Reference

Unable to properly show content in all devices

I'm making a car research/ranking website using React. Coming to the issue, I have 3 cards, with content on it once you hover over it.
It works perfectly well in desktops, but it doesn't properly show content in smaller devices: it overflows to the other section.
To fix this, I have added a media query to it, but it doesn't work either.
Please check my code:
.sec2 {
height: 100vh;
width: 100%;
color: white;
display: flex;
justify-content: center;
align-items: center;
flex-direction: column;
background: linear-gradient(to left, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)),
url(https://static.feber.se/article_images/48/81/62/488162_1920.jpg)
no-repeat top center;
}
.wrapper {
display: flex;
width: 90%;
justify-content: space-around;
}
.card {
width: 350px;
height: 370px;
border-radius: 15px;
padding: 1.5rem;
position: relative;
object-fit: fill;
display: flex;
align-items: flex-end;
transition: 0.4s ease-out;
box-shadow: 0px 7px 10px rgba(0, 0, 0, 0.5);
}
.card:hover {
transform: translateY(20px);
}
.card:hover:before {
opacity: 1;
}
.card:hover .info {
opacity: 1;
transform: translateY(0px);
}
.card:before {
content: "";
position: absolute;
top: 0;
left: 0;
display: block;
width: 100%;
height: 100%;
border-radius: 15px;
background: rgba(0, 0, 0, 0.6);
z-index: 2;
transition: 0.5s;
opacity: 0;
}
.card img {
width: 100%;
height: 100%;
object-fit: cover;
position: absolute;
top: 0;
left: 0;
border-radius: 15px;
}
.card .info {
position: relative;
z-index: 3;
color: white;
opacity: 0;
transform: translateY(30px);
transition: 0.5s;
}
.card .info h1 {
margin: 0px;
font-size: 2rem;
}
.card .info p {
letter-spacing: 1px;
font-size: 15px;
margin-top: 8px;
}
.card .info button {
padding: 0.6rem;
outline: none;
border: none;
border-radius: 3px;
background: white;
color: black;
font-weight: bold;
cursor: pointer;
transition: 0.4s ease;
}
.card .info button:hover {
background: dodgerblue;
color: white;
}
#media only screen and (min-width: 600px) and (max-width: 768px) {
.wrapper {
flex-direction: column;
justify-content: center;
align-items: center;
}
.card {
height: 270px;
padding: 1rem;
width: 250px;
margin-bottom: 10px;
}
.card .info h1 {
font-size: 1rem;
}
.card .info p {
font-size: 15px;
}
.card .info button {
padding: 0.4rem;
font-weight: normal;
font-size: 12px;
}
}
#media (max-width: 600px) {
.wrapper {
flex-direction: column;
justify-content: center;
align-items: center;
}
.card {
height: 15%;
padding: 0.3rem;
width: 180px;
margin-bottom: 5px;
}
.card .info h1 {
font-size: 1rem;
}
.card .info p {
font-size: 10px;
}
.card .info button {
padding: 0.3rem;
font-weight: normal;
font-size: 10px;
}
}
And
<div>
<header className="sec2" id="section2">
<h1>
What is in this website?
</h1>
<div class="wrapper">
<div class="card">
<img src="https://cdn.jdpower.com/JDPA_2022%20Genesis%20G70%20Red%20Front%20Quarter%20View.jpg" />
<div class="info">
<h1>Car Rankings</h1>
<p>
It contains cars ranked based on body type, done after
comprehensive research.
</p>
<button>Go</button>
</div>
</div>
<div class="card">
<img src="https://i0.wp.com/autonxt.net/wp-content/uploads/2018/01/autocontentexp.com2018-Lincoln-Navigator5-5b1aebecc618f268352b037fb2253a291d670994-1.jpg?resize=2500%2C1500&ssl=1" />
<div class="info">
<h1>Car Reviews</h1>
<p>Contains reviews of selective cars written by us.</p>
<button>Read More</button>
</div>
</div>
<div class="card">
<img src="https://static0.hotcarsimages.com/wordpress/wp-content/uploads/2020/09/AWD-e1600115646672.jpg" />
<div class="info">
<h1>Used Cars/h1>
<p> We rank used cars so that you will only get the best out of it.
</p>
<button>Read More</button>
</div>
</div>
</div>
</header>
</div>
Image in computer: click, and
Image in smaller devices: click

first add the margin: auto in .wrapper class and some margin: 5px; to .card class because this make content in the center and looks good.
.wrapper {
display: flex;
width: 90%;
margin: auto;
justify-content: space-around;
}
.card {
/* your code */
margin: 5px;
}
Now, add just update margin: 15px; of all .card instead of margin-bottom
Here is the full code, https://codesandbox.io/s/laughing-gwen-4i47v5?file=/src/Home.jsx

Overflow hidden on bottom of image

Im trying to hide the bottom of the girl image when the 3D background is triggered. I tried to add the overflow: hidden; to the test-imgplace class and it doesn't look right.
Is there a better way to fix it?
See what I did on JSFIDDLE
.card .image {
height: 275px;
width: 183px;
background-size: cover;
background-position: center center;
}
.imgtest {
position: absolute;
z-index: 1;
text-align: center;
top: 0;
left: 100px;
border: solid 1px;
pointer-events: none;
}
.test-imgplace {
margin: 0 auto;
position: relative;
overflow: hidden;
}
.card .text {
height: 20%;
margin: 0;
color: #fff;
display: flex;
align-items: center;
justify-content: center;
text-transform: uppercase;
font-size: 50px;
position: absolute;
right: 0;
left: 0;
top: 0;
bottom: 0;
}
.card {
width: 183px;
height: 275px;
margin: auto auto;
background: #383030;
border-radius: 5px;
overflow: hidden;
text-align: center;
}
.card-content {
transform-style: preserve-3d;
}
body {
display: flex;
justify-content: center;
align-items: center;
flex-wrap: wrap;
}
.hover-in {
transition: .3s ease-out;
}
.hover-out {
transition: .3s ease-in;
}
.card-hover {
margin: 0;
}
<div class="test-imgplace">
<img src="https://christianluneborg.com/imgs/test-woman.png" class="imgtest">
<div class="card-hover">
<div class="card">
<div class="card-content">
<div class="image" style="background-image: url(https://christianluneborg.com/imgs/test-woman-bg.png);"></div>
</div>
</div>
</div>
</div>

how to move button on bottom using css?

I am trying to move my button on bottom (some pixel above bottom).so it always be in bottom whether it contend is less or large. I tried using flex-box also not able to do that.Container have min-height : 500px
here is my code
https://jsbin.com/joyalosate/edit?html,css,output
Expected output :: Explore products move bottom with some pixel above bottom .
.bottom__block {
position: absolute;
bottom: 20px;
padding: 0 40px;
/* display: flex;
flex-direction: column; */
border: 1px solid;
min-height:500px;
}
HTML
<div class="rh02w2">
<div class="bottom__block">
<button class="rh02-pcontent" data-lbl="panel2-home-apps-content-area">
<h1 class="rh02-ttl">Tetst <b>Applications</b></h1>
<div class="rh02-sub">Complete Suite of Apps</div>
<div class="rh02-leadin">
<p>Streamline your enterprise business process. With ERP Financials, Procurement, Project Portfolio Management and more, you can increase productivity, lower costs, and improve controls.</p>
</div>
</button>
<div class="rh02w4">
<div class="rh02-cta">
<div class="obttns">
<div>
<a data-lbl="panel2-home-apps-learn-more">Explore products</a>
</div>
</div>
</div>
</div>
</div>
</div>
css
.rh02w2 {
background-color: #325C72;
height: calc(100vh - 60px);
transform: translateY(60px);
left: 0;
min-width: 100%;
position: absolute;
margin-top: -60px;
color: #FBF9F8;
}
.bottom__block {
position: absolute;
bottom: 20px;
padding: 0 40px;
/* display: flex;
flex-direction: column; */
border: 1px solid;
min-height:500px;
}
.obttns {
width: 100%;
font-size: 1.4rem;
margin-bottom: -1.6rem;
display: -ms-flexbox;
display: flex;
flex-flow: row wrap;
-ms-flex-pack: start;
justify-content: flex-start;
-ms-flex-align: stretch;
align-items: stretch;
}
.obttns>div>* {
color: #161513 !important;
background: #fff;
}
.obttns a {
font-size: 1em;
font-weight: 500;
font-family: inherit;
line-height: 1.2;
padding: 10px;
border-radius: 4px;
cursor: pointer;
position: relative;
border: 0;
min-height: 30px;
height: 100%;
text-align: center;
display: -ms-flexbox;
display: flex;
-ms-flex-direction: column;
-ms-flex-wrap: wrap;
flex-flow: column wrap;
-ms-flex-pack: center;
justify-content: center;
-ms-flex-align: center;
align-items: center;
}
}

Replace your CSS with this.
.rh02w2 {
background-color: #325c72;
height: calc(100vh - 60px);
transform: translateY(60px);
left: 0;
min-width: 100%;
position: absolute;
margin-top: -60px;
color: #fbf9f8;
}
.bottom__block {
position: absolute;
bottom: 20px;
padding: 0 40px;
/* display: flex;
flex-direction: column; */
border: 1px solid;
min-height: 500px;
}
.rh02w4 {
position: absolute;
bottom: 10px;
left: 50%;
transform: translateX(-50%);
}
.obttns {
width: 100%;
font-size: 1.4rem;
}
.obttns > div > * {
color: #161513 !important;
background: #fff;
}
.obttns a {
font-size: 1em;
font-weight: 500;
font-family: inherit;
line-height: 1.2;
padding: 10px;
border-radius: 4px;
cursor: pointer;
position: relative;
border: 0;
min-height: 30px;
height: 100%;
text-align: center;
display: -ms-flexbox;
display: flex;
-ms-flex-direction: column;
-ms-flex-wrap: wrap;
flex-flow: column wrap;
-ms-flex-pack: center;
justify-content: center;
-ms-flex-align: center;
align-items: center;
}

If you want to display your button about 10% above the bottom of the screen you can use the margin-top: 90%; in css. Here is the entire code alongside a button:
<button style="margin-top: 90%;">hi</button>
You can edit the 90% depending on how far down the button is on your screen. Since the code is also using the percentage instead of pixels, it will adjust depending on your screen size.

Toggling nav icon in browser mobile screen size will make nav-list-items dissapear when readjusting browser screen to large size

Hello my current issue is that when the page initially loads the navigation works and appears properly when the browser is enlarged, however when readjusting the browser window to a smaller size, toggling the nav menu icon works but however will either
a) readjust the layout in the larger web browser screen if the mobile menu was left open
or
b) navigation items will entirely disappear if the mobile menu was closed
when readjusting the browser window back to the larger screen size.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Chispot_Blog</title>
<link rel="stylesheet" href="css/style.css">
<script src="https://kit.fontawesome.com/a23422f356.js" crossorigin="anonymous"></script>
<script type="text/javascript">
function toggle_visibility(id) {
var e = document.getElementById(id);
if(e.style.display == 'block')
e.style.display = 'none';
else
e.style.display = 'block';
}
// Trying to figure out toggling visibility issue with navigation when going back to large screen
// let navi = document.getElementById("nav-list");
// navi.addEventListener(onresize, toggle_visibility){
// display = "block";
// };
</script>
</head>
<!-- Hamburger Icon from font awesome -->
<!-- <i class="fas fa-bars"></i> -->
<body>
<header>
<nav>
<a href="index.html"><img class="logo" src="images/Component 1.png" alt="blog spot logo">
<ul id="nav-list">
<li class="nav-list-item">home</li>
<li class="nav-list-item">cafes</li>
<li class="nav-list-item">views</li>
<li class="nav-list-item">posts</li>
</ul>
</nav>
<div class="hide">
<i class="fas fa-bars fa-lg hamburger ham-toggle"></i>
</div>
</header>
I have tried to put display:block property under the appropriate class selector inside the larger media query. Which didn't populate any nav-list-items, I kept the display:flex property because thats how I want the nav-list-items to be formatted in the larger layout.
/* general */
body{
margin: 0;
font-family: Arial, Helvetica, sans-serif;
}
img{
width: 100%;
}
a:hover, a:focus{
color: black;
}
a .icon:hover{
color: yellow;
}
.logo{
width: 12em;
margin-top: .5em;
margin-bottom: .5em;
}
.main-image{
height: 80%;
width: 95%;
object-fit: cover;
border: 1em;
border-color: #111111;
border-style: solid;
}
.featured-img{
height: 90%;
width: 100%;
object-fit: cover;
order: 1;
padding: 1em;
background-color: lightgray;
margin-left: auto;
margin-right: auto;
margin-bottom: 1em;
}
.secondary-featured-article-img{
height: 75%;
width: 90%;
object-fit: cover;
order: 1;
padding: .75em;
background-color: lightgray;
}
/* Typography */
h1{
font-size: 8rem;
text-align: center;
}
h3{
font-size: 3rem;
margin-bottom: 0;
}
h4{
font-size: 2rem;
font-weight: 700;
margin-bottom: 0;
margin-top: 0;
}
h5{
font-size: 1.25rem;
font-weight: 700;
margin-bottom: 0;
}
.site-intro-body{
font-size: 1.15rem;
font-weight: lighter;
justify-content: center;
align-items: center;
order: 2;
}
.secondary-featured-article-body{
font-size: .9rem;
font-weight: lighter;
}
footer{
background-color: black;
color: white;
}
.side-page-post-title{
margin-top: .5em;
margin-bottom: 0;
padding-top: .25em;
padding-bottom: .25em;
background-color: black;
color: white;
}
.side-page-post-body{
margin-left: 6em;
margin-right: 6em;
margin-top: 2em;
margin-bottom: 2em;
}
/* Layout Mobile Screen*/
header{
background-color: #f8f8f8;
width: 100%;
margin-bottom: 0;
display: flex;
justify-content: space-between;
align-items: center;
position: fixed;
z-index: 999;
}
header .hamburger{
margin-top: 1em;
margin-right: 1em;
align-content: flex-start;
/* visibility: hidden; HIDE WHEN IN MEDIA QUERY */
}
nav{
display: flex;
width: 100%;
flex-direction: column;
padding-left: 2em;
align-items: center;
justify-content: center;
}
#nav-list{
margin-top: 0;
display: flex;
flex-direction: column;
justify-content: row;
list-style: none;
margin-bottom: 0;
display: none;
}
.nav-list-item{
margin: .1em;
font-size: 1.5rem;
font-weight: 700;
}
a{
text-decoration: none;
color: darkgray;
}
main{
display: flex;
flex-direction: column;
width: 100%;
}
.main-content{
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
margin-bottom: 4em;
background-color: black;
color: white;
margin-top: 0;
padding-bottom: 3em;
padding-top: 4em;
}
.site-intro{
width: 90%;
padding: 0 5em;
}
.site-intro p{
column-count: 2;
}
.site-photo{
height: 100%;
width: 90%;
display: flex;
justify-content: center;
align-items: center;
order: 1;
}
.article-content{
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
padding-bottom: 5em;
margin-top: 0;
}
.featured-article{
width: 90%;
display: flex;
flex-direction: column;
justify-content: space-around;
align-items: flex-start;
padding-right: 2em;
padding-top: 2.5em;
}
.featured-article-body{
width: 100%;
order: 2;
margin-top: 0;
text-align: center;
}
.secondary-featured-article-section{
width: 100%;
display: flex;
flex-direction: column;
}
.secondary-featured-article{
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
padding-bottom: 2em;
padding-top: 2em;
margin-bottom: 0;
}
.secondary-featured-article-body{
width: 95%;
order: 2;
margin-top: 0;
text-align: center;
}
.secondary-featured-article-border{
border-bottom: .15em lightgray solid;
}
footer{
padding-top: 3em;
padding-bottom: 3em;
}
.footer-body{
display: flex;
justify-content: center;
align-items: center;
margin-bottom: 1em;
}
.social-media-icons{
display: flex;
justify-content: center;
align-items: center;
}
.icon{
margin-right: .5em;
}
.hide{
height: 100%;
align-self: flex-start;
}
.side-page-post-body{
margin-top: 4em;
margin-bottom: 4em;
}
.article-listings{
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
width: 95%;
margin-left: auto;
margin-right: auto;
}
.article-listing{
display: flex;
height: 45vh;
justify-content: space-around;
align-items: center;
margin-bottom: 2em;
background-color: whitesmoke;
padding-top: 2em;
padding-bottom: 2em;
}
.article-blog-description{
display: flex;
width: 50%;
height: 90%;
flex-direction: column;
align-items: flex-start;
justify-content: flex-start;
order: 2;
}
.article-listing-image{
order: 1;
width: 40%;
height: 90%;
object-fit: cover;
align-items: center;
}
.article-listing-title{
font-size: 1.75em;
margin-bottom: .5em;
}
.article-listing-body{
margin-top: 0;
font-size: .9em;
}
/* Layout Large Screen*/
#media screen and (min-width: 760px){
.main-image{
height: 75vh;
width: 90%;
object-fit: cover;
border: 1em;
border-color: #111111;
border-style: solid;
}
.featured-img{
height: 70vh;
width: 45%;
object-fit: cover;
order: 1;
padding: 1em;
background-color: lightgray;
}
.secondary-featured-article-img{
height: 40vh;
width: 45%;
object-fit: cover;
order: 1;
padding: .75em;
background-color: lightgray;
}
header{
background-color: #f8f8f8;
width:100%;
margin-bottom:0;
display:flex;
justify-content:space-between;
align-items:center;
position: fixed;
}
header .hamburger{
margin-top: auto;
margin-bottom: auto;
margin-right: 1em;
visibility: hidden; /*HIDE WHEN IN MEDIA QUERY */
}
nav{
display: flex;
flex-direction: row;
justify-content: flex-start;
padding-left: 2em;
align-items: center;
}
#nav-list{
margin-top: 0;
display: flex;
flex-direction: row;
justify-content: row;
list-style: none;
margin-bottom: 0;
visibility: visible;
}
.nav-list-item{
margin: 1em;
font-size: 1.5rem;
font-weight: 700;
}
I'm currently using a simple script I had found on css-tricks but am open to alternative suggestions to resolve the problem of wanting to simply hide and show the nav menu without any issues affecting the other layout in the large media query.

You need set the display property of #nav-list back to flex when switching to larger viewport, since it's already overrided when mobile navigation is toggled.
#media screen and (min-width: 760px){
#nav-list {
display: flex!important;
}
}

Sticky header script doesn't account for variable height of window

I have a sticky header that utilizes the process found here (https://www.w3schools.com/howto/howto_js_sticky_header.asp). This works great. However, this does not account for variable heights of the hero element above the header. When you resize the window vertically, the sticky header breaks until you refresh the browser. What do I need to add to the script so that it detects the new height upon resizing?
Here is a codepen displaying my dilemma: https://codepen.io/JKDESIGN44/pen/VwYBqBV
Here is the javascript:
// STICKY HEADER
document.addEventListener('DOMContentLoaded', function () {
// When the event DOMContentLoaded occurs, it is safe to access the DOM
// When the user scrolls the page, execute myFunction
window.addEventListener('scroll', myFunctionForSticky);
// Get the navbar
var navbar = document.getElementById("c3Header");
// Get the offset position of the navbar
var sticky = navbar.offsetTop;
// Add the sticky class to the navbar when you reach its scroll position.
// Remove "sticky" when you leave the scroll position
function myFunctionForSticky() {
if (window.pageYOffset >= sticky) {
console.log("window.pageYOffset >= sticky");
} else {
console.log("Not window.pageYOffset >= sticky");
}
if (window.pageYOffset >= sticky) {
navbar.classList.add("sticky");
} else {
navbar.classList.remove("sticky");
}
}
})

You don't need any JS to accomplish this. All you need are two lines of css to be able to accomplish the same, with way less complexity.
Take a look at this:
html, body, header{
margin: 0px;
padding: 0px;
}
.full-height-section{
height: 100vh;
width: 100%;
position: relative;
}
a{
text-decoration: none;
font-family: 'Montserrat', sans-serif;
color: inherit;
}
li{
list-style-type: none;
text-transform: uppercase;
font-size: 15px;
letter-spacing: 2px;
transition: all 0.1s ease;
}
.bg-aqua{
background-color: #073038;
}
.text-white{
color: #FFFFFF;
transition: all 0.1s ease;
font-family:
}
.text-hover-blue:hover{
color: #7DD2EF;
transition: all 0.1s ease;
}
/* --------------HEADER---- */
/* ----HERO---- */
.hero{
height: 100vh;
width: 100vw;
min-height: 500px;
position: relative;
display: flex;
justify-content: center;
align-content: center;
align-items: center;
}
.hero-text{
font-size: 40px;
text-transform: uppercase;
z-index: 20;
}
.content-hero{
height: 25vh;
width: 100vw;
min-height: 500px;
position: relative;
display: flex;
justify-content: center;
align-content: center;
align-items: center;
}
.hero-bg{
display: block;
object-fit: cover;
z-index: -1;
position: absolute;
min-height: 500px;
}
.hero-logo-wrap{
align-self: center;
height: 30vw;
max-height: 50vh;
min-height: 200px;
z-index: 10;
}
.hero-logo{
height: 100%;
}
.down-arrow-wrapper{
height: 50px;
width: 50px;
position: absolute;
margin: auto;
left: 0;
right: 0;
bottom: 40px;
border-radius: 999px;
background-color: rgba(125,210,239,0.0);
transition: all 0.5s ease;
z-index: 10;
}
.down-arrow-wrapper:hover{
background-color: rgba(125,210,239,1.0);
transition: all 0.5s ease;
transform: scale(1.2)
}
.down-arrow-rel-wrapper{
height: 50px;
width: 50px;
position: relative;
}
.down-arrow{
height: 20px;
width: 20px;
position: absolute;
margin: auto;
left: 0;
right: 0;
top: 8px;
transform: rotate(45deg);
border-right: solid #fff 3px;
border-bottom: solid #fff 3px;
}
.img-overlay{
height: 100%;
width: 100%;
position: absolute;
margin: auto;
top: 0;
mix-blend-mode: overlay;
background: rgb(3,31,36);
background: -moz-linear-gradient(148deg, rgba(3,31,36,1) 0%, rgba(125,210,239,1) 100%);
background: -webkit-linear-gradient(148deg, rgba(3,31,36,1) 0%, rgba(125,210,239,1) 100%);
background: linear-gradient(148deg, rgba(3,31,36,1) 0%, rgba(125,210,239,1) 100%);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr="#031f24",endColorstr="#7dd2ef",GradientType=1);
}
/* ----HERO END---- */
.header{
height: 150px;
width: 100%;
z-index: 100;
display: flex;
justify-content: center;
position: sticky;
top: 0;
}
.content-header{
width: 100%;
z-index: 100;
display: flex;
flex-direction: column;
}
.sticky{
position: fixed;
top: 0;
width: 100%;
}
.sticky + .page-wrapper{
padding-top: 150px;
}
.nav-flexbox{
height: 150px;
width: 80%;
max-width: 1500px;
min-width: 1000px;
position: relative;
/*
position: absolute;
margin: auto;
left: 0;
right: 0;
*/
display: flex;
flex-direction: row;
justify-content: space-between;
align-items: center;
}
.nav-left{
display: flex;
flex-direction: row;
justify-content: space-between;
text-transform: uppercase;
letter-spacing: 2px;
width: 100%;
}
.nav-center{
width: 70%;
display: flex;
justify-content: center;
align-items: center;
}
.header-logo{
height: 80px;
z-index: 999;
}
.header-logo-link{
transition: all 0.5s ease;
}
.header-logo-link:hover{
transform: scale(1.2);
transition: all 0.5s ease;
}
.nav-right{
display: flex;
flex-direction: row;
justify-content: space-between;
text-transform: uppercase;
letter-spacing: 2px;
width: 100%;
}
.tab-nav-center{
display: none;
}
.tab-nav-right{
display: none;
}
.content-sub-nav{
height: 50px;
width: 100%;
display: flex;
flex-direction: row;
justify-content: space-between;
align-content: center;
}
.sub-nav-arrow {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-bottom: 30px solid #031F24;
position: absolute;
margin: auto;
bottom: 0;
left: 10px;
}
/* ---------------HEADER END---- */
.content-section{
height: calc(100vh - 150px);
display: flex;
justify-content: center;
align-items: center;
}
<head>
<link href="https://fonts.googleapis.com/css?family=Montserrat:400,500,700&display=swap" rel="stylesheet">
</head>
<header>
<!----------------
HERO
------------------>
<div class="hero full-height-section">
<div class="hero-logo-wrap">
<img src="http://c3.abettermancc.com/wp-content/uploads/2019/09/Primary-Logo_Vertical.png" class="hero-logo">
</div>
<a href="#c3Header">
<div class="down-arrow-wrapper">
<div class="down-arrow">
</div>
</div>
</a>
<img src="http://c3.abettermancc.com/wp-content/uploads/2019/09/audience-black-and-white-black-and-white-2014773.jpg" class="hero-bg full-height-section">
<!--------------Overlay -->
<div class="bg-aqua" style="width: 100%; height: 100%; position: absolute;
margin: auto; top: 0; opacity: 0.7; z-index: 9;">
</div>
<div class="img-overlay" style="z-index: 9;">
</div>
<!--------------Overlay END -->
</div>
<!----------------
HERO END
------------------>
</header>
<!----------------
NAVIGATION
------------------>
<nav class="header bg-aqua text-white" id="c3Header">
<div class="nav-flexbox">
<div class="nav-left">
<li>who we are</li>
<li>ministries</li>
<li>sermons</li>
</div>
<div class="nav-center">
<a href="#" class="header-logo-link">
<img src="http://c3.abettermancc.com/wp-content/uploads/2019/09/Primary-Icon-01.png" class="header-logo">
</a>
</div>
<div class="nav-right">
<li>get connected</li>
<li>events</li>
<li>give online</li>
</div>
</div>
</nav>
<!----------------
NAVIGATION END
------------------>
<div class="content-section" style="background-color: #888888;">
<p>SECTION 1</p>
</div>
<div class="content-section" style="background-color: #999999;">
<p>SECTION 2</p>
</div>
<div class="content-section" style="background-color: #888888;">
<p>SECTION 3</p>
</div>
The trick was adding:
position: sticky;
top: 0;
To the .header class. The top:0 states that this class content will only get sticky when it reaches 0 offset from the top (meaning, just at the top of the page).