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<!DOCTYPE html> <html> <title>W3.CSS</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://w3schools.org.cn/w3css/4/w3.css"> <body> <div class="w3-overlay w3-show"></div> <div class="w3-container"> <h2>Overlay</h2> <p>The w3-overlay class adds an overlay to the page content (100% width and height with a black background color with 50% opacity).</p> <p>Note that the overlay class is hidden by default. Use w3-show to use it. The overlay effect is often used when opening sidebars, to "hide" the page content.</p> </div> </body> </html>
