/* HTML: <div class="loader"></div> */
.loader {
    display: none;
    margin: 16px auto;
    color: #17F38C;
    width: 4px;
    aspect-ratio: 1;
    border-radius: 50%;
    box-shadow: 19px 0 0 7px, 38px 0 0 3px, 57px 0 0 0;
    transform: translateX(-38px);
    animation: l21 .5s infinite alternate linear;
}
  
@keyframes l21 {
    50%  {box-shadow: 19px 0 0 3px, 38px 0 0 7px, 57px 0 0 3px}
    100% {box-shadow: 19px 0 0 0  , 38px 0 0 3px, 57px 0 0 7px}
}
.loader.active{
    display: block;
}