.loader{width:120px;height:22px;border-radius:40px;color:#fff;border:2px solid;position:relative}.loader:before{content:"";position:absolute;margin:2px;width:25%;top:0;bottom:0;left:0;border-radius:inherit;background:currentColor;animation:l3 1s linear infinite}@keyframes l3{50%{left:100%;transform:translateX(calc(-100% - 4px))}}