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<!DOCTYPE html> <html> <head> <title>Let's Coding Example</title> </head> <style> body { background-color: #ff0000; animation: colorChange 3s infinite alternate; } @keyframes colorChange { 0% { background-color: #ff0000; } 50% { background-color: #00ff00; } 100% { background-color: #ff0000; } } </style> <body> <h1>Heading 1</h1> </body> </html>
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