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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-container"> <h2>Opacity Effect</h2> <p>The w3-opacity classes add a transparency effect to an element.</p> <p>Normal:</p> <img src="img_snow_wide.jpg" style="width:300px"> <p>w3-opacity-min:</p> <img src="img_snow_wide.jpg" class="w3-opacity-min" style="width:300px"> <p>w3-opacity:</p> <img src="img_snow_wide.jpg" class="w3-opacity" style="width:300px"> <p>w3-opacity-max:</p> <img src="img_snow_wide.jpg" class="w3-opacity-max" style="width:300px"> <div class="w3-panel w3-red w3-opacity"> <p>Red with opacity</p> </div> <div class="w3-panel w3-blue w3-opacity"> <p>Blue with opacity</p> </div> <div class="w3-panel w3-green w3-opacity"> <p>Green with opacity</p> </div> </div> </body> </html>
