.loader{border:0 solid transparent;border-radius:50%;width:100px;height:100px}.loader:after,.loader:before{content:"";border:7px solid #000;border-radius:50%;width:inherit;height:inherit;position:absolute;animation:loader 2s linear infinite;opacity:0}.loader:before{animation-delay:1s}@keyframes loader{0%{transform:scale(1);opacity:0}50%{opacity:1}to{transform:scale(0);opacity:0}}