a.scroll{padding-top:80px}a.scroll span{opacity:0;box-sizing:border-box;border-bottom:1px solid #fff;border-left:1px solid #fff;width:24px;height:24px;margin-left:-12px;animation:2s infinite sdb;position:absolute;top:0;left:50%;transform:rotate(-45deg)}a.scroll span:first-of-type{animation-delay:0s}a.scroll span:nth-of-type(2){animation-delay:.15s;top:16px}a.scroll span:nth-of-type(3){animation-delay:.3s;top:32px}@keyframes sdb{0%{opacity:0}50%{opacity:1}to{opacity:0}}