.lds-ring {
   display: inline-block;
   position: relative;
   width: 10px;
   height: 10px;
 }
 .lds-ring div {
   box-sizing: border-box;
   display: block;
   position: absolute;
   width: 16px;
   height: 16px;
   margin: 10px;
   border: 2px solid #AAA;
   border-radius: 50%;
   animation: lds-ring 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
   border-color: #AAA transparent transparent transparent;
 }
 .lds-ring div:nth-child(1) {
   animation-delay: -0.45s;
 }
 .lds-ring div:nth-child(2) {
   animation-delay: -0.3s;
 }
 .lds-ring div:nth-child(3) {
   animation-delay: -0.15s;
 }
 @keyframes lds-ring {
   0% {
     transform: rotate(0deg);
   }
   100% {
     transform: rotate(360deg);
   }
 }