.loading {
    margin: 5px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 10px dotted;
    transform: rotate(0);
    animation: rotate 1s infinite;
}
@keyframes rotate {
    0% {
        transform: rotate(0);
    }
    25% {
        transform: rotate(90deg);
    }
    50% {
        transform: rotate(180deg);
    }
    75% {
        transform: rotate(270deg);
    }
    100% {
        transform: rotate(360deg);
    }
}