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