.custom-loader {
  --c:linear-gradient(#16e9db 0 0);
  background: 
    var(--c),
    var(--c),
    var(--c),
    var(--c),
    var(--c),
    var(--c),
    var(--c),
    var(--c),
    var(--c);
  background-size: 16px 16px;
  background-repeat: no-repeat;
  animation: 
    sh2-1 1s infinite,
    sh2-2 1s infinite;
}

@keyframes sh2-1 {
  0%,100% {width:45px;height: 45px}
  35%,65% {width:65px;height: 65px}
}

@keyframes sh2-2 {
  0%,40%  {background-position: 0 0,0 50%, 0 100%,50% 100%,100% 100%,100% 50%,100% 0,50% 0,  50% 50% }
  60%,100%{background-position: 0 50%, 0 100%,50% 100%,100% 100%,100% 50%,100% 0,50% 0,0 0,  50% 50% }
}