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<!DOCTYPE html> <html> <head> <title>Title of the document</title> <style> @keyframes blinking { 0% { background-color: #06c3d1; border: 3px solid #666; } 100% { background-color: #270da6; border: 3px solid #666; } } #blink { width: 200px; height: 200px; animation: blinking 1s infinite; } </style> </head> <body> <div id="blink"></div> </body> </html>