代码

<div className='kuang'></div>

css代码

 .kuang {height: 500px;width: 400px;// background-color: #fff;position: absolute;z-index: 10;bottom: 0;transform: translateX(-390px)}.kuang:hover {animation: myanimation 3s linear 1;animation-fill-mode:forwards;background-color: #fff;}@keyframes myanimation {0%{transform: translateX(-400px);}100%{transform:translateX(0);}}

实现效果