.spinner{--size:30px;--color:#fff;width:100px;height:100px;position:relative}.spinner:after,.spinner:before{box-sizing:border-box;position:absolute;content:"";width:var(--size);height:var(--size);top:50%;animation:up 2.4s cubic-bezier(0,0,.24,1.21) infinite;left:50%;background:#000;box-shadow:0 0 calc(var(--size) / 3) rgba(0,0,0,.25)}.spinner:after{background:#000;top:calc(50% - var(--size));left:calc(50% - var(--size));animation:down 2.4s cubic-bezier(0,0,.24,1.21) infinite}@keyframes down{0%,to{transform:none}25%{transform:translateX(100%)}50%{transform:translateX(100%) translateY(100%)}75%{transform:translateY(100%)}}@keyframes up{0%,to{transform:none}25%{transform:translateX(-100%)}50%{transform:translateX(-100%) translateY(-100%)}75%{transform:translateY(-100%)}}