.loader{width:65px;height:30px;position:relative}.loader:before{content:"";position:absolute;border-radius:50px;box-shadow:inset 0 0 0 3px #000;animation:l3 .75s infinite alternate}@keyframes l3{0%{inset:0 35px 0 0}50%{inset:0 0 0 0}to{inset:0 0 0 35px}}