Creating a full-screen background with an rgba overlay using CSS

I recently encountered an issue with a fixed, fullscreen background image on my website. I initially applied the background image to the HTML's CSS instead of the body's CSS. To add a black overlay with lowered opacity, I included the following code in the body's CSS:

background:rgba(0, 0, 0, 0.6), url(image.jpg);

Despite trying variations such as removing the comma from the code, I faced difficulty in getting it to work properly. Setting height: 100% for the body did solve the problem up to a certain point. However, when scrolling down, the overlay only covered up to the screen height and didn't extend further.

The specific page I'm working on is a gallery that mainly consists of one or two tall portrait images. The issue arises when these images stretch beyond the screen, causing the overlay not to follow.

If there isn't a simple solution, I was wondering if implementing conditional JavaScript code could help dynamically adjust the body's height when viewing those particular images?

htmlcssbackgroundoverlayfullscreen

Answer №1

To create an overlay on top of the page, you can implement a div that remains fixed in its position even while scrolling. This will ensure it covers the entire screen. Check out the example below for reference.

The overlay div is set to fixed, with its top: 0 property keeping it at the top consistently. Its dimensions are set to 100%, making sure it fills the entire screen. You can then apply your desired background settings on the body or any other element.

.overlay {
  height: 100%;
  width: 100%;
  background: rgba(0, 0, 0, 0.6);
  position: fixed;
  top: 0;
}
.content {
  height: 1000px;
  background: green;
}
<div class="overlay"></div>
<div class="content">Text</div>
<div class="content">Text</div>

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