How to place background image using ::before pseudo selectors in CSS ?

Difficulty Level : Expert
Last Updated : 14 Dec, 2020

Given a web page and the task is to place the background image on web page using ::before pseudo selector.

The ::before pseudo selector is used to place something before the content of the selected items.

Syntax:

.container::before{
    content: '';
    background: url(image file);
    position:absolute;
    top:0px;
    left:0px;
}

Approach: The ::before pseudo selector places the background image before the selected element and if the selected element has a background color associated with it, we can use the z-index property to make the background image visible.

Example:

HTML

<!DOCTYPE html>
<html lang="en">
  
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content=
        "width=device-width, initial-scale=1.0">
          
    <title>
        How to place the background image 
        using ::before pseudo selectors ?
    </title>
  
    <style>
        * {
            margin: 0px;
            padding: 0px;
        }
  
        body {
            text-align: center;
        }
  
        h1 {
            color: green;
        }
  
        .container {
            width: 100vw;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            color: black;
            font-weight: bold;
            font-size: 2rem;
        }
  
        .container::before {
            content: '';
            background: url('bg.png') 
                no-repeat center center/cover;
            position: absolute;
            opacity: 0.3;
            top: 0px;
            left: 0px;
            width: 100vw;
            height: 100vh;
            z-index: -1;
        }
  
        span {
            font-size: 2em;
        } 
    </style>
</head>
  
<body>
    <div class="container">
        GeeksforGeeks<br><br>
        How to place background image using
        ::before pseudo selectors ?
    </div>
</body>
  
</html>

Output:

Image Reference: https://media.geeksforgeeks.org/wp-content/cdn-uploads/20200212230557/How-To-Become-A-Web-Developer-in-2020-A-Complete-Guide.png

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How to place background image using ::before pseudo selectors in CSS ?

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