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<!DOCTYPE html> <html> <head> <style> #container { width: 300px; height: 200px; border: 2px solid #00f; animation: anim 5s infinite; margin: auto; padding: 20px; box-shadow: 0 0 10px 0 #ddd; } @keyframes anim { 50% {border-right: 20px solid #ff0;} } </style> </head> <body> <h1>Animatable 'border-right' Property</h1> <hr> <p>Experience the changing color and width of the border right of the container using border-right property.<p> <div id="container"> Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. </div> </body> </html>