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How to detect device and swap the CSS file ?

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  • Last Updated : 30 Apr, 2021

When creating a webpage, the most important thing is the user experience with the frontend, especially the designing part or CSS. For a smooth experience, a frontend developer needs to make the webpage responsive. As “one size doesn’t fit all”, a single design will not work on all devices. That’s why the “media query” was introduced. Media queries are very helpful when it comes to styling specific parts of the website on the basis of the screen width, height, bits/pixel, and many more.
But sometimes writing media queries can be confusing if a lot of them are to be written or if we have to completely change the styling of the webpage for different devices. So, we can use different CSS files for different screen sizes.

This can be done by adding media query in the <link rel=”stylesheet” href=”style.css”> section in the HTML file.

Media query can be added to the linking section of CSS like this, given below

<link rel="stylesheet" media="media query properties" href="stylesheet.css">

Media type that can be used

all (default)Used for all media type devices
print   Used for printers
screenUsed for computer screens, tablets, smart-phones etc.
speechUsed for screen readers that “reads” the page out loud

Some commonly used media feature for making webpage responsive

max-widthSets a maximum width till which CSS properties will be followed
min-widthSets a minimum width till which CSS properties will be followed
orientationCan be set to portrait/landscape

Note: All features of media query can be used while linking CSS to the HTML.


<doctype html="html">
    <html lang="en" dir="ltr">
            <!-- main css -->
            <link rel="stylesheet" href="master.css">
            <!-- CSS with media query -->
            <link rel="stylesheet" 
              media="screen and (max-width: 360px)" 
            <link rel="stylesheet" 
              media="screen and (min-width: 360px) and (max-width: 550px)" 

CSS Files:

  • 1. master.css file


    // master.css
    body {
        display: flex;
        align-items: center;
        font-family: sans-serif;

  • 2. small-screen.css file


    // small-screen.css
    body {
        color: rgb(29, 176, 5);
        background-color: white;

  • 3. large-screen.css file


    // large-screen.css
    body {
        color: rgb(67, 164, 55);
        background-color: black;


When the width of the screen is less than 360px

When the width of the screen is more than 360px and less than 550px

When the width of the screen is larger than 550px

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