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<!DOCTYPE html> <html> <head> <style> .element { padding: 50px; animation: pulse 4s infinite; } @keyframes pulse { 0% { background-color: #8ebf42; } 50% { background-color: #1c87c9; } 100% { background-color: #d5dce8; } } </style> </head> <body> <div class="element">L'arrière-plan de ce texte est animé en utilisant la propriété CSS3 animation.</div> </body> </html>