Code Run - Live Demo

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>CSS Media Queries</title>
<style>
    /* Smartphones (portrait and landscape) ---------- */
    @media screen and (min-width: 320px) and (max-width: 480px){
        body{
			background: purple;
		}
    }
    /* Smartphones (portrait) ---------- */
    @media screen and (max-width: 320px){
        body{
			background: yellow;
		}
    }
    /* Smartphones (landscape) ---------- */
    @media screen and (min-width: 321px){
        body{
			background: skyblue;
		}
    }
    /* tablets, iPads (portrait and landscape) ---------- */
    @media screen and (min-width: 768px) and (max-width: 1024px){
        body{
			background: purple;
		}
    }
    /* tablets, iPads (portrait) ---------- */
    @media screen and (min-width: 768px){
        body{
			background: yellow;
		}
    }
    /* tablets, iPads (landscape) ---------- */
    @media screen and (min-width: 1024px){
        body{
			background: orange;
		}
    }
    /* Desktops and laptops ---------- */
    @media screen and (min-width: 1224px){
        body{
			background: red;
		}
    }
    /* Large screens ---------- */
    @media screen and (min-width: 1824px){
        body{
			background:green;
		}
    }
</style>
</head>
<body>
    <h1>CSS Media Queries</h1>
    <p>The background of the output area is different in different media or devices.</p>
    <p><strong>Note:</strong> Media queries allow you to adjust the display of your web pages for a certain range of devices like as mobile phones, tablets, desktops, and so on, without changing the markup.</p>
</body>
</html>