CSS Properties: How to change the background-color if the viewport is 400 pixels wider

Last update on February 23 2024 13:05:40 (UTC/GMT +8 hours)

Solution:

HTML Code:

<!DOCTYPE html><!-- Declares the document type and version of HTML -->
<html><!-- Begins the HTML document -->
<head><!-- Contains metadata and links to external resources -->
<title>How to change the background-color if the viewport is 400 pixels wider</title><!-- Sets the title of the document -->
<style type="text/css"> /* Starts CSS styling */
body { /* Selects the body element */
    background-color: #3300FF; /* Sets the background color of the body */
}
@media screen and (min-width: 400px) { /* Media query for screens with a minimum width of 400 pixels */
    body { /* Selects the body element within the media query */
        background-color: #00FFFF; /* Changes the background color of the body for screens wider than 400 pixels */
    }
}
</style><!-- Ends CSS styling -->
</head><!-- Ends the head section -->
<body><!-- Begins the body of the document -->
<p>w3resource Tutorial</p><!-- Paragraph element with text content -->
<h2>Resize the browser window and see @media effect!</h2><!-- Heading element with text content -->
<p>CSS, stands for Cascading Style Sheet is a computer language to describe presentation (for example width, height, color, background color, alignment etc.) of HTML and XML (and XML based languages like XHTML, SVG) web documents. In all the examples of our tutorials, we have used HTML for implementing CSS.</p><!-- Paragraph element with text content -->
</body><!-- Ends the body section -->
</html><!-- Ends the HTML document -->

Explanation:

This HTML document demonstrates the use of a media query in CSS to change the background color of the body based on the width of the viewport.
CSS comments are added to explain each section of the code.
The initial background color of the body is set to #3300FF.
The @media rule is used to define a media query for screens with a minimum width of 400px.
Within the media query, the background color of the body is changed to #00FFFF for screens wider than 400px.
Users can resize the browser window to observe the effect of the media query on the background color.

Live Demo :

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Supported browser


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