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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