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<!DOCTYPE html> <html> <head> <title>Title of the document</title> <style> div { width: 10px; height: 100px; background: red; border-radius: 50%; position: relative; -webkit-animation: element 4s infinite; animation: element 4s infinite; } @-webkit-keyframes element { 0% { top: 0px; background: #1c87c9; width: 100px; } 100% { top: 200px; background: #8ebf42; width: 150px; } } @keyframes element { 0% { top: 0px; background: #1c87c9; width: 100px; } 100% { top: 200px; background: #8ebf42; width: 150px; } } </style> </head> <body> <h2>@keyframes rule example</h2> <div></div> </body> </html>