CSS3 animation设置图片上下移动

<img src="./images/kaihu.png" alt="开户">

 <style>
        img {
            width: 142px;
            height: 118px;
            position: relative;
            top: 0px;
            animation: myMove 2s infinite;
            -webkit-animation: myMove 2s infinite;
            /* infinite 表示无限循环 */
        }

        @keyframes myMove {
            0% {
                top: 0px;
            }

            50% {
                top: 100px;
            }

            100% {
                top: 0px;
            }
        }

        @-webkit-keyframes myMove {
            0% {
                top: 0px;
            }

            50% {
                top: 100px;
            }

            100% {
                top: 0px;
            }
        }
    </style>