.indexBox{position:relative;width:100%;cursor:pointer}.indexBox .index{display:block;width:100%}.indexBox .enter{position:absolute;left:50%;top:47.5%;transform:translate(-50%);width:10.2%;animation:enter 3s ease-in-out infinite}@keyframes enter{0%{transform:translate(-50%) scale(1)}50%{transform:translate(-50%) scale(1.2)}to{transform:translate(-50%) scale(1)}}