Image gallery visible over a fixed header - html

Question

I am trying to implement a fixed header on a relatively simple site I am working on. It works on every page except one with an image gallery I have co-opted where the fixed header appears behind the photos in the gallery. I have tried setting the z-index property but it is either not working or I don't quite understand how it works. Any help would be much appreciated.
CSS:
#charset "utf-8";
/* CSS Document */
*{margin:0; padding:0;}
.clr{
clear: both;
}
.parallax {
background-image: url("../images/bg.jpg");
height: 1080px;
background-attachment: fixed;
background-position: center;
background-repeat: no-repeat;
background-size: cover;
}
.sticky {
position: fixed;
top: 0;
width: 100%
}
a{
text-decoration: none;
color:#000000;
}
a:hover{
color:#FF0004;
}
a:active{
color:#000000;
}
a:visited{
color:#000000;
}
.main-header{
background-color: #ffffff;
line-height: 1;
}
.main-header h1{
color: #F800FF;
font-size: 9vw;
padding: 0;
}
.navbar{
background-color:#BCBCBC;
color:#FFFFFF;
width:100%;
line-height: normal;
padding: 1vw;
}
.navbar ul{
padding: 0px;
list-style: none;
}
.navbar li{
display:inline;
}
.navbar a{
color: #FFFFFF;
text-decoration: none;
vertical-align: middle;
font-size: calc(10px + .6vw);
padding: 1.5vw;
}
.navbar a:hover{
*/border-top: #F800FF solid thick;*/
}
.footer-bar{
background-color:#BCBCBC;
color:#FFFFFF;
line-height: normal;
padding-top: 1vw;
padding-bottom: 1vw;
margin-top: 2vw;
}
.footer-bar ul{
padding: 0px;
list-style: none;
}
.footer-bar li{
display:inline;
margin-left: .5vw;
margin-right: .5vw;
}
body{
margin: 0;
/*background-image: url("");
background-size:cover;
background-position: center center;
background-repeat: no-repeat;
background-attachment: fixed;*/
background-color: #ffffff;
color: #000000;
font-family: Gotham, "Helvetica Neue", Helvetica, Arial, "sans-serif";
font-size: 18px;
font-weight: normal;
line-height: 1.6em;
}
h1{
color:#000000;
font-size: 3vw;
padding-bottom: .5em;
padding-top: 1.5em;
}
h2{
font-size: 2vw;
color:#000000;
padding-bottom: .5em;
padding-top: .5em;
}
h3{
font-size: 2vw;
color:#000000;
padding-bottom: .5em;
padding-top: .5em;
}
.container{
}
.container{
width: 80%;
margin: auto;
text-align: center;
}
.container-h{
width: 95%;
margin: auto;
text-align: center;
}
.container-f{
width: 95%;
margin: auto;
text-align: center;
}
.box-1{
background-color: #ffffff;
color: #000000;
/*opacity: 0.9;*/
/*filter: alpha(opacity=90);*/
padding: 10px;
margin: 20px 0;
}
.categories{
background-color:#00FFE8;
color:#000000;
/*opacity: 0.9;*/
/*filter: alpha(opacity=90);*/
border: 10px solid #000000;
padding: 10px;
}
.categories ul{
padding: 0;
list-style: none;
}
.categories li{
padding-bottom: 4px;
border-bottom: 2px #000000 dashed;
}
/*FOR CSS IMAGE GALLERY*/
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
.heading {
text-align: center;
font-size: 2.0em;
letter-spacing: 1px;
padding: 40px;
color: white;
}
.gallery-image {
padding: 20px;
display: flex;
flex-wrap: wrap;
justify-content: center;
}
.gallery-image img {
height: 250px;
width: 350px;
transform: scale(1.0);
transition: transform 0.4s ease;
}
.gallery-image-c img {
height: 350px;
width: 350px;
transform: scale(1.0);
transition: transform 0.4s ease;
}
.img-box {
box-sizing: content-box;
margin: 10px;
height: 250px;
width: 350px;
overflow: hidden;
display: inline-block;
color: white;
position: relative;
background-color: white;
}
.img-box-c {
box-sizing: content-box;
margin: 10px;
height: 350px;
width: 350px;
overflow: hidden;
display: inline-block;
color: white;
position: relative;
background-color: white;
}
.caption {
position: absolute;
bottom: 5px;
left: 20px;
opacity: 0.0;
transition: transform 0.3s ease, opacity 0.3s ease;
}
.transparent-box {
height: 250px;
width: 350px;
background-color:rgba(0, 0, 0, 0);
position: absolute;
top: 0;
left: 0;
transition: background-color 0.3s ease;
}
.transparent-box-c {
height: 350px;
width: 350px;
background-color:rgba(0, 0, 0, 0);
position: absolute;
top: 0;
left: 0;
transition: background-color 0.3s ease;
}
.img-box:hover img {
transform: scale(1.1);
}
.img-box-c:hover img {
transform: scale(1.1);
}
.img-box:hover .transparent-box {
background-color:rgba(0, 0, 0, 0.5);
}
.img-box-c:hover .transparent-box-c {
background-color:rgba(0, 0, 0, 0.5);
}
.img-box:hover .caption {
transform: translateY(-20px);
opacity: 1.0;
}
.img-box-c:hover .caption {
transform: translateY(-20px);
opacity: 1.0;
}
.img-box:hover {
cursor: pointer;
}
.img-box-c:hover {
cursor: pointer;
}
.caption > p:nth-child(2) {
font-size: 0.8em;
}
.opacity-low {
opacity: 0.5;
}
HTML:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<header class="main-header">
<div class="container-h">
<h1>HEADING</h1>
</div>
</header>
<nav class="navbar" id="myNavbar">
<div class="container">
<ul>
<li>menu</li>
<li>menu</li>
<li>menu</li>
<li>menu</li>
<li>menu</li>
<li>menu</li>
</ul>
</div>
</nav>
<div class="box-1">
<div class="container">
<div class="gallery-image">
<a href="images/bandpics/promo1.jpg" target="_blank"><div class="img-box">
<img src="images/bandpics/promo1.jpg" alt="" />
<div class="transparent-box">
<div class="caption">
<p></p>
<p class="opacity-low"></p>
</div>
</div>
</div></a>
<a href="images/bandpics/poster.jpg" target="_blank"><div class="img-box">
<img src="images/bandpics/poster.jpg" alt="" />
<div class="transparent-box">
<div class="caption">
<p> </p>
<p class="opacity-low"> </p>
</div>
</div>
</div></a>
<a href="images/bandpics/promo2.jpg" target="_blank"><div class="img-box">
<img src="images/bandpics/thumbs/promo2.jpg" alt="" />
<div class="transparent-box">
<div class="caption">
<p> </p>
<p class="opacity-low"> </p>
</div>
</div>
</div></a>
<a href="images/bandpics/promo3.jpg" target="_blank"><div class="img-box">
<img src="images/bandpics/thumbs/promo3.jpg" alt="" />
<div class="transparent-box">
<div class="caption">
<p> </p>
<p class="opacity-low"> </p>
</div>
</div>
</div></a>
<a href="images/bandpics/band1.jpg" target="_blank"><div class="img-box">
<img src="images/bandpics/thumbs/band1.jpg" alt="" />
<div class="transparent-box">
<div class="caption">
<p> </p>
<p class="opacity-low"> </p>
</div>
</div>
</div></a>
<a href="images/bandpics/band2.jpg" target="_blank"><div class="img-box">
<img src="images/bandpics/thumbs/band2.jpg" alt="" />
<div class="transparent-box">
<div class="caption">
<p> </p>
<p class="opacity-low"> </p>
</div>
</div>
</div></a>
<a href="images/bandpics/band1.jpg" target="_blank"><div class="img-box">
<img src="images/bandpics/thumbs/band1.jpg" alt="" />
<div class="transparent-box">
<div class="caption">
<p> </p>
<p class="opacity-low"> </p>
</div>
</div>
</div></a>
<a href="images/bandpics/band3.jpg" target="_blank"><div class="img-box">
<img src="images/bandpics/thumbs/band3.jpg" alt="" />
<div class="transparent-box">
<div class="caption">
<p> </p>
<p class="opacity-low"> </p>
</div>
</div>
</div></a>
<a href="images/bandpics/falling.jpg" target="_blank"><div class="img-box">
<img src="images/bandpics/thumbs/falling.jpg" alt="" />
<div class="transparent-box">
<div class="caption">
<p> </p>
<p class="opacity-low"> </p>
</div>
</div>
</div></a>
<a href="images/bandpics/terrorpromo.jpg" target="_blank"><div class="img-box">
<img src="images/bandpics/thumbs/terrorpromo.jpg" alt="" />
<div class="transparent-box">
<div class="caption">
<p> </p>
<p class="opacity-low"> </p>
</div>
</div>
</div></a>
<a href="images/bandpics/mirror.jpg" target="_blank"><div class="img-box">
<img src="images/bandpics/thumbs/mirror.jpg" alt="" />
<div class="transparent-box">
<div class="caption">
<p> </p>
<p class="opacity-low"> </p>
</div>
</div>
</div></a>
<a href="images/bandpics/promo4.jpg" target="_blank"><div class="img-box">
<img src="images/bandpics/thumbs/promo4.jpg" alt="" />
<div class="transparent-box">
<div class="caption">
<p> </p>
<p class="opacity-low"> </p>
</div>
</div>
</div></a>
</div>
</div>
</div>
<div class="clr"></div>
<footer class="footer-bar">
<div class="container-f">
<ul>
<li><img src="images/socialmedia/instagram.png" alt="Instagram" style="width: calc(20px + 2vw)"</li>
<li><img src="images/socialmedia/facebook.png" alt="Facebook" style="width: calc(20px + 2vw)"</li>
<li><img src="images/socialmedia/twitter.png" alt="Twitter" style="width: calc(20px + 2vw)"</li>
<li><img src="images/socialmedia/spotify.png" alt="Spotify" style="width: calc(20px + 2vw)"</li>
<li><img src="images/socialmedia/apple.png" alt="Apple Music" style="width: calc(20px + 2vw)"</li>
<li><img src="images/socialmedia/youtube.png" alt="YouTube" style="width: calc(20px + 2vw)"</li>
<li><img src="images/socialmedia/soundcloud.png" alt="Soundcloud" style="width: calc(20px + 2vw)"</li>
</ul>
</div>
</footer>
<script>
window.onscroll = function() {myFunction()};
var navbar = document.getElementById("myNavbar");
var sticky = navbar.offsetTop;
function myFunction() {
if (window.pageYOffset > sticky) {
navbar.classList.add("sticky");
} else {
navbar.classList.remove("sticky");
}
}
</script>
</body>
</html>

Answer 1

Unless I misunderstood your question, but if you add z-index: 1: to navbar class it seems to fix your problem.
.navbar {
z-index: 1;
}