Looking to generate a div with a custom size and then place something on top of it. How can I accurately position and resize the overlay to match the underlying div using CSS?
Looking to generate a div with a custom size and then place something on top of it. How can I accurately position and resize the overlay to match the underlying div using CSS?
To position an overlay inside your div and stretch it in all directions, you can use the position:absolute property like this:
CSS updated *
.overlay {
position:absolute;
top:0;
left:0;
right:0;
bottom:0;
background-color:rgba(0, 0, 0, 0.85);
background: url(data:;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAABl0RVh0U29mdHdhcmUAUGFpbnQuTkVUIHYzLjUuNUmK/OAAAAATSURBVBhXY2RgYNgHxGAAYuwDAA78AjwwRoQYAAAAAElFTkSuQmCC) repeat scroll transparent\9; /* ie fallback png background image */
z-index:9999;
color:white;
}
Ensure that the parent div has the position:relative property added and a lower z-index.
I have created a demo that works in all browsers, including IE7+. Click below to view:
I replaced the opacity property with an RGBA color for the background opacity level without affecting the content. For IE compatibility, I used a base64 encoded PNG background image for the overlay div. This workaround avoids the opacity issue applying to children elements in IE.
Although I may be arriving late to the gathering, here's a neat trick for styling any element with CSS only, without the need to play around with positioning or overlay divs. You can achieve this effect by using an inset box shadow:
box-shadow: inset 0px 0px 0 2000px rgba(0,0,0,0.5);
This technique will work perfectly on elements that are smaller than 4000 pixels in length or width.
Check out this live example: http://jsfiddle.net/jTwPc/
http://example.com/code-sample
Styling with CSS:
#container{
border:2px dashed red;
position:relative;
}
#overlay{
position:absolute;
top:0;
left:0;
bottom:0;
right:0;
background-color:rgba(0,255,0,0.5);
}
Discover a creative way to use a pseudo-element for an overlay without the need for additional markup
.box {
background: 0 0 url(http://ianfarb.com/wp-content/uploads/2013/10/nicholas-hodag.jpg);
width: 300px;
height: 200px;
}
.box:after {
content: "";
display: block;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.4);
} <div class="box"></div>div{
background-image:url('example.jpg');
background-size:cover;
background-position:top center;
position:relative;
}
div:before{
content:'';
position:absolute;
left:0;
top:0;
height:100%;
width:100%;
background-color:rgba(0,0,0,0.7);
}
If you're looking to position elements on top of each other, using CSS attributes is the way to go. You can utilize position: absolute to achieve this effect.
Here's an example:
<div id="container">
<div id="on-top">Top!</div>
<div id="on-bottom">Bottom!</div>
</div>
Along with the following CSS styling:
#container { position: relative; }
#on-top { position: absolute; z-index: 5; }
#on-bottom { position: absolute; z-index: 4; }
For more guidance, I recommend checking out this resource.
And if you'd like to see a live example, take a look at this JSFiddle demo.
To avoid the need for an additional div overlay, you can utilize z-index manipulation with the following CSS approach:
/* Ensure that ::before is positioned relative to .bar */
.bar { position: relative; }
/* Overlay styling */
.bar::before {
content: '';
display: block;
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0,0,0,0.5);
z-index: 0;
}
/* Ensure all elements within .bar are visually above the overlay element */
.bar > * { z-index: 1; }
Recently, I was experimenting with a similar issue on codepen and came up with a solution to create an overlay using a straightforward css markup. To achieve this, I first created a div element with the class .box applied to it. Within this div, I added two sub-divs with classes .inner and .notext respectively. Initially, both of these sub-divs inside the .box were set to display:none, but when the .box is hovered over, they become visible.
.box{
height:450px;
width:450px;
border:1px solid black;
margin-top:50px;
display:inline-block;
margin-left:50px;
transition: width 2s, height 2s;
position:relative;
text-align: center;
background:url('https://upload.wikimedia.org/wikipedia/commons/c/cd/Panda_Cub_from_Wolong,_Sichuan,_China.JPG');
background-size:cover;
background-position:center;
}
.box:hover{
width:490px;
height:490px;
}
.inner{
border:1px solid red;
position:relative;
width:100%;
height:100%;
top:0px;
left:0px;
display:none;
color:white;
font-size:xx-large;
z-index:10;
}
.box:hover > .inner{
display:inline-block;
}
.notext{
height:30px;
width:30px;
border:1px solid blue;
position:absolute;
top:0px;
left:0px;
width:100%;
height:100%;
display:none;
}
.box:hover > .notext{
background-color:black;
opacity:0.5;
display:inline-block;
}<div class="box">
<div class="inner">
<p>Panda!</p>
</div>
<div class="notext"></div>
</div>Feel free to give any feedback or suggestions on this approach. Hopefully, it proves to be helpful! :)
To address your issue without access to the specific HTML and CSS you are working with, consider implementing the z-index property.
#content1 {
position: relative;
z-index: 1;
}
#content2 {
position: relative;
z-index: 2;
}
In this scenario, content2 will act as the overlay element.
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