@keyframes rotation {
        0% {
            -webkit-transform: rotate(0deg);
            opacity: 0.1;
        }

        20% {
            opacity: 0.1;
        }

        40% {
            opacity: 0.25;
        }

        80% {
            opacity: 0.1;
        }

        100% {
            -webkit-transform: rotate(359deg);
            opacity: 0.1;
        }
  }
.rotation {
animation: rotation 1.2s infinite cubic-bezier(.63,.33,.46,.71);
}