.indexBox{position:relative;width:100%;cursor:pointer}.indexBox .index{width:100%;display:block}.indexBox .enter{position:absolute;width:11.8%;left:50%;transform:translate(-50%);top:86.8%;animation:enter 3s ease-in-out infinite}@keyframes enter{0%,to{transform:translate(-50%) scale(1);opacity:1}50%{transform:translate(-50%) scale(.8);opacity:.8}}