.scroll{width:42px;height:42px;border:2px solid #3147ff;border-radius:50%;position:relative;animation:down 1.5s infinite;-webkit-animation:down 1.5s infinite;&:before{content:"";position:absolute;top:10.5px;left:12.6px;width:12.6px;height:12.6px;border-left:2px solid #3147ff;border-bottom:2px solid #3147ff;transform:rotate(-45deg)}}@keyframes down{0%{transform:translate(0)}20%{transform:translateY(10.5px)}40%{transform:translate(0)}}@-webkit-keyframes down{0%{transform:translate(0)}20%{transform:translateY(10.5px)}40%{transform:translate(0)}}@keyframes scroll{0%{height:28px}30%{height:49px}60%{height:28px}}@-webkit-keyframes scroll{0%{height:28px}30%{height:49px}60%{height:28px}}