.center {
    margin:0;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%)
}

.rotate {
animation: rotation 4s infinite linear;
}

@keyframes rotation {
from {
  transform: translate(-50%, -50%) rotate(0deg);
}
to {
  transform: translate(-50%, -50%) rotate(360deg);
}
}