CSS让图片上下浮动

效果图：

@keyframes movepoint {
    25% {top: 16px}
    100% {top: 50px}
}
.shade-button-point {
    display: inline-block;
    position: absolute;
    top: 50px;
    left: 30%;
    animation: movepoint 2s infinite;
    -webkit-animation: movepoint 2s infinite;
}

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