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``` <style> div{ height: 2px; width: 1000px; animation-name: shanke; animation-delay: 1s; animation-duration: 5s; animation-iteration-count: infinite; animation: shanke 5s infinite; } @keyframes shanke{ 0%{ width: 0; } 25%{ width: 25%; background: pink; } 50%{ width: 50%; background: plum; } 75%{ width: 75%; background: palevioletred; } 100%{ width: 100%; background: purple; } } </style> ``` ``` <body> <div></div> </body> ```