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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="4/w3.css"> <body> <div class="w3-container"> <h2>Text Opacity</h2> <div class="w3-panel w3-pink"> <h2 class="w3-opacity">Text Opacity</h2> </div> <div class="w3-panel w3-blue"> <h2 class="w3-opacity">Text Opacity</h2> </div> <div class="w3-panel w3-orange"> <h2 class="w3-opacity">Text Opacity</h2> </div> <div class="w3-panel w3-black"> <h2 class="w3-opacity">Text Opacity</h2> </div> </div> </body> </html>