.loader{background:#0006;width:100%;height:4.8px;display:inline-block;position:relative;overflow:hidden}.dark .loader{background:#fff6}.loader:after{content:"";box-sizing:border-box;background:#000;width:0;height:4.8px;animation:2.2s linear infinite animFw;position:absolute;top:0;left:0}@keyframes animFw{0%{width:0}to{width:100%}}