#loading {
    max-width: 10vw;
    margin: 10vw;

    animation-name: rotate;
    animation-duration: 0.35s;
    animation-iteration-count: infinite;
}

@keyframes rotate {
    0% {
        rotate: 1deg;
    }

    50% {
        rotate: 180deg;
    }

    100% {
        rotate: 360deg;
    }
}