.spinner{width:16px;height:16px;border-radius:50%;display:block;margin:15px auto;position:relative;background:#fff;box-shadow:-24px 0 #fff,24px 0 #fff;box-sizing:border-box;animation:shadowPulse 1.5s linear infinite}@keyframes shadowPulse{33%{background:#fff;box-shadow:-24px 0 #818cf8,24px 0 #fff}66%{background:#818cf8;box-shadow:-24px 0 #fff,24px 0 #fff}to{background:#fff;box-shadow:-24px 0 #fff,24px 0 #818cf8}}