Position Overlay Div

#container {  width: 100px;  height: 100px;  position: relative;}#navi,#infoi {  width: 100%;  height: 100%;  position: absolute;  top: 0;  left: 0;}#infoi {  z-index: 10;}

<div id="container">  <div id="navi">a</div>  <div id="infoi">    <img src="https://appharbor.com/assets/images/stackoverflow-logo.png" height="20" width="32" />b  </div></div>

How to cover a div with another div as overlay

take the both div inside a root div.Then set the root div position:relative and overlay div absolute. fix the height and width. and apply display:bloCK on overlay div. If still does not work than apply z-index.

This should be like:
HTML:

<div class="parent">
     <div id="area" class="area"></div>
     <div class="area cover"></div>
</div>

CSS:

.parent{
  position: relative;
  height:200px;
  width: 200px;
}
.cover{
  position: absolute;
  height: 100%;
  width: 100%;
  display: block;
  z-index: 999;
}

Hopefully this will work for you.

Overlay image on div

Use position: relative on the parent and position: absolute on the child.

div {
  width: 400px;
  height: 200px;
  background-color: lightcoral;
  margin: auto;
}

.parent {
  position: relative;
}

.child {
  position: absolute;
  top: -15px;
  left: -15px;
  background-image: url('https://picsum.photos/200');
  width: 100px;
  height: 100px;
}

<div class="parent">
  <div class="child">
  </div>
</div>

Overlay div is not appearing on top of my main div

position your .overlaycontainer by adding these CSS lines and it will show up.

    position: absolute;
    left: 0;
    top: 0;

An element must have a height and width to show up, it does not mean we always have to set width and height to elements. What was happening is, you were setting the height of the .overlaycontainer to 100% and it was not taking it and for that its parent must-have fix width to work.

Normally overlay is positioned.

The position property is used to manipulate the location of an element.
The position:absolute is always refer to its parent, which needs to be set as position:relative.

When you change the left or top value the position of the .overlaycontainer changes. if you give position: relative to the parent or any grandparents element of the overlay (in must of the cases you have to), it will change its location on that respect. if any of the element's ancestors has no position: relative which is our case, the element will be relative to the body.

How to overlay one div in the middle of 2 divs

body {
  font-family: system-ui;
  background: #f06d06;
  color: white;
  text-align: center;
  margin:0;
}
.bgimage{
  position:absolute;
  left:0;
  top:0;
  width:100%;
  height:100%;
  background: url(https://images.pexels.com/photos/1324803/pexels-photo-1324803.jpeg?auto=compress&cs=tinysrgb&dpr=3&h=750&w=1260) no-repeat center;
}
.overlay{
  position:absolute;
  left:0;
  top:0;
  width:100%;
  height:100%;
  z-index:1;
  background-color:rgba(0,0,0,0.5);
}
h1{
  position:relative;
  z-index:2;
}

<div class="bgimage">
</div>
<div class="overlay">
</div>
<h1>Title Goes Here</h1>

How to correctly position an overlay on a card?

try moving .locked-overlay div inside .game-card div and use position relative on .game-card css

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