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CSS: Adding Hover Overlay causes div to appear at the top of the screen as well

I'm working with a CSS Overlay for an image, trying to get text to display when the image is hovered. I have it working, but for some reason, the text is also all appearing as a blob above the gallery. I think it's to do with the position tag I'm using, but I'm not sure how to reproduce exactly. Code below + CSB:
https://codesandbox.io/s/eager-moore-qeki7
gallery
{
data.map((edge) => (
<div key={edge} className={styles.imgHov}>
<Img
fluid={edge.node.data.one}
className={styles.image}
/>
<div className={styles.overlay} key={edge}>
<p className={styles.text}>{edge.node.data.item_one}</p>
<p className={styles.text}>{edge.node.data.item_two}</p>
</div>
</div>
))
}
css
.imgHov:hover{
position: relative;
}
.image{
width: 25vw;
height: 25vw;
object-fit: cover;
}
.overlay{
position: absolute;
z-index: 999;
margin: 0 0;
left: 0;
right: 0;
top: 40%;
width: 60%;
background-color: pink;
height: 60%;
width: 25vw;
}
.overlay .text{
color: white;
font-family: Geomanist;
}

I translated your app in normal HTML, i think this should meet your requirements :)
.imgHov{
position: relative;
width: 25vw;
height: 25vw;
}
.image{
width: 100%;
height: 100%;
object-fit: cover;
}
.overlay{
display: none;
position: absolute;
z-index: 999;
margin: 0 0;
left: 0;
right: 0;
top: 40%;
width: 60%;
background-color: pink;
height: 60%;
width: 25vw;
}
.overlay .text{
color: white;
font-family: Geomanist;
}
.imgHov:hover .overlay {
display: block;
}
<div class="imgHov">
<img class="image" src="https://static.scientificamerican.com/sciam/cache/file/92E141F8-36E4-4331-BB2EE42AC8674DD3_source.jpg"/>
<div class="overlay">
<p class="text">item one</p>
<p class="text">item two</p>
</div>
</div>

How to create the following image as header background in HTML5 and CSS3?

I am working on a site.Is it possible to make a div with a curved bottom by using html5 css3 and javascript. It's look like
Curved header bottom

.container {
width: 100%;
height: 400px;
background-color: lightgray;
position: relative;
overflow: hidden;
}
.inner {
position: absolute;
background-color: black;
top: -200px;
left: -50%;
height: 400px;
width: 200%;
border-radius: 50%;
}
<div class='container'>
<div class='inner'>
</div>
</div>

Position element over image element but the image changes size with the window

I have an image which changes size to the windows size, and I need to position an element (anchor tag) on it so that it is always in the same place relative to the image. The image is not a background image but an HTML element.
This question is very similar but is for when the image is a background image.
Position element over background image. But the BG img changes size with the window. CSS
<img src="images/img.jpg" >
Link that should be over the image in a certain location.

<div class="wrapper">
<img src="images/img.jpg">
Link that should be over the image in a certain location.
</div>
<style>
.wrapper {
position: relative;
}
a {
position: absolute;
top: 10%;
left: 10%;
}
</style>

Wrap the image etc in an shrink-wrapped div and base the positioning off that.
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.map {
margin: 10px;
border: 5px solid red;
position: relative;
display: inline-block;
}
.map img {
max-width: 100%;
display: block;
}
.box {
width: 5%;
height: 5%;
background-image: url(http://www.clker.com/cliparts/W/0/g/a/W/E/map-pin-red.svg);
background-position: top center;
background-repeat: no-repeat;
background-size: contain;
position: absolute;
}
#pin-1 {
top: 25%;
left: 36%;
}
.box:hover > .pin-text {
display: block;
}
.pin-text {
position: absolute;
top: 50%;
transform: translateY(-50%);
left: 75%;
white-space: nowrap;
display: none;
}
.pin-text h3 {
color: white;
text-shadow: 1px 1px 1px #000;
}
<div class="map">
<img src="http://connect.homes.com/wp-content/uploads/2012/05/200392710-0012.jpg" alt="" />
<div id="pin-1" class="box">
<div class="pin-text">
<h3>My House</h3>
</div>
</div>
</div>
Codepen Demo

Do you mean something like this?
.image {
position: relative;
width: 100%; /* for IE 6 */
}
a {
position: absolute;
top: 20px;
left: 0;
width: 100%;
}
<div class="image">
<img src="http://kingofwallpapers.com/grey/grey-001.jpg"/>
Link that should be over the image in a certain location.
</div>

How to move images slightly up on scroll using Jquery?

I'm trying to create a simple parallax effect using Jquery (without plugins). Basically I have a few different images layered on-top of each-other and need them to move slightly upwards at different speeds when a user scrolls down, similar to a parallax scrolling effect.
Here's the layout so far (excuse the sloppy code):
body {
position: relative;
width: 100%;
height: auto;
margin: 0 auto;
background-color: #ededed;
z-index: 4;
display: table;
}
.header {
position: relative;
width: 100%;
background-color: #ffde15;
height: 900px;
margin-left: auto;
margin-right: auto;
}
.headertopimg {
position: absolute;
width: 100%;
z-index: 10;
}
.headerbehindimg {
position: absolute;
width: 100%;
z-index: 9;
top:0%;
}
.headerbehindbehindimg {
position: absolute;
width: 100%;
z-index: 8;
margin-top: 8%;
}
.headerbgimg {
position: absolute;
width: 70%;
z-index: 7;
left: 50%;
margin-left: -35%;
}
<body>
<div class="header">
<div class="headertop"><img src="http://i.imgur.com/z2DORfA.png" class="headertopimg"> </div>
<div class="headerbehind"><img src="http://i.imgur.com/o1Yl0PD.png" class="headerbehindimg"></div>
<div class="headerbehindbehind"><img src="http://i.imgur.com/VQxs9LD.png" class="headerbehindbehindimg"></div>
<div class="headerbg"><img src="http://i.imgur.com/t5fTRZe.png" class="headerbgimg"></div>
</div>
</body>
Any help would be much appreciated!

Positioning z-index does not work as expected

I cannot position info-pop-title on top of bar-header as you can see from my current code the text "TEST----" is visible but under the bar-header element.
http://jsfiddle.net/uvh4ymh9/
Could you point me out what am I doing wrong and how to fix it
PS: I cannot change structure for the HTML, only CSS solution
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<style>
.bar-header, .bar-footer {
position: fixed;
left: 0px;
width: 1280px;
z-index: 1;
background-color: rgba(50,50,50,0.5);
text-align: center;
}
.bar-header {
top: 0px;
height: 60px; /* safearea top 25 + content 20 + space bottom 15*/
}
.bar-header h1 {
position: fixed;
top: 25px; /* safearea top 25 */
left: 25px; /* safearea left */
font-size: 20px; /* content */
}
.bar-footer {
top: 670px;
height: 50px; /* safearea bottom 20 + content 20 + space top 10 */
font-size: 20px; /* content */
}
.bar-footer > ul {
position: fixed;
top: 680px; /* footer top 670 + space top 10*/
left: 1150px;
}
.bar-footer > ul li {
float: left;
}
.bar-footer li:nth-child(1) span {
color: blue;
}
#scene-main {
position: fixed;
top: 0px;
left: 0px;
width: 1280px;
height: 720px;
/*background: #ffffff url("/auth/assets/tv-safearea-transparent.png") no-repeat left;*/
background-color: darkgrey;
}
#btn-up, #btn-down {
position: fixed;
left: 1230px;
width: 50px;
height: 50px;
background-color: yellow;
outline: 1px solid black;
z-index: 200;
}
#btn-up {
top: 0px;
}
#btn-down {
top: 50px;
}
#content {
position: fixed;
top: 0px; /* header */
}
.content-section:first-child {
margin-top: 60px; /* header height content does not go under header */
}
.content-section {
background-color: lightgray;
outline: 1px solid black;
width: 1280px;
}
/* Content sizes */
.content-snippet {
height: 360px; /* 1 slots */
width: 1280px;
background-color: lightblue;
outline: 1px solid green;
}
.content-snippet:nth-child(even) {
background-color: lightcoral;
}
.content-section h2 {
position: relative;
top: 30px; /**avoid to go under the header bar*/
}
.active {
background-color: violet !important;
}
.snippet-pop-info {
position: fixed;
top: 640px; /*430 = final position as visible / 670 = final position as not visible */
width: 1280px;
height: 240px;
background-color: darkblue;
opacity: 1;
color: white;
}
.snippet-pop-info ul {
position: absolute;
top: 0px;
left: 1155px;
width: 100px;
}
.snippet-pop-info ul li {
width: 100px;
}
.snippet-pop-info .rating {
position: absolute;
top: 65px;
left: 25px;
unicode-bidi: bidi-override;
direction: rtl;
}
.snippet-pop-info .rating > span {
display: inline-block;
position: relative;
width: 20px;
}
.snippet-pop-info .rating > span:hover:before,
.snippet-pop-info .rating > span:hover ~ span:before {
content: "\2605";
position: absolute;
}
#info-pop-title {
position: fixed;
top: 0px;
left: 250px;
z-index: 1;
font-size: 30px;
color: white;
font-weight: bold;
}
#info-pop-description {
position: absolute;
overflow: hidden; /* hide content that does not fit in the columns*/
top: 25px;
left: 300px; /* TEST */
height: 80px;
width: 800px;
font-size: 20px;
-webkit-column-count: 2;
-webkit-column-gap: 10px;
column-count: 2;
column-gap: 10px;
}
</style>
</head>
<body>
<div id="viewport">
<div id="scene-main" class="scene" style="">
<div class="bar-header"><h1>ChannelLive logo</h1></div>
<div id="page">
<div id="content">
<div id="snippet-cnt-0" class="content-snippet">
0
<div class="snippet-pop-info" style="top: 720px;">
<h1 id="info-pop-title" style="word-wrap: break-word;">TEST-----------------</h1>
<div class="rating"><span>☆</span><span>☆</span><span>☆</span><span>☆</span><span>☆</span></div>
<div id="info-pop-description" style="word-wrap: break-word;">null</div>
<ul>
<li class="focusable" data-href="movie-play">Play</li>
<li class="focusable" data-href="movie-details">Details</li>
</ul>
</div>
</div>
</div>
</body>
</html>

It's not clear what you're trying to accomplish, but I can make Chrome work like Firefox by getting rid of the
position: fixed;
style from #content. Whether that will work in the larger context of your layout, I don't know, but the problem is that the way z-index works is weird and complicated, and involves not just individual fixed elements but also any fixed parents they might have.
edit — oh also, set the z-index of .snippet-pop-info to 2. Here is an updated version of your fiddle.

Make your
.bar-header, .bar-footer{
z-index:0;
}
This will do the trick. Since your z-index for .bar-header and .info-pop-title are the same.

Add z-index in your content div
#content
{
position:fixed;
top:0;
z-index:1;
}

I'm afraid you can't make it work with the way your html is nested.
The element you want to pull on top to cover the rest is located in the main container while your second element is isolated in the header. If you want to bring your info-pop-title there you'll have to change the z-index of your #page element, which will cover everything.
The only thing I see you can achieve with this structure would be to position your diverse containers relatively and change the css of your info-pop-title with a negative margin, position absolutely this time.