.loader {
    width: 48px;
    height: 48px;
    border: 3px dotted #FFF;
    border-style: solid solid dotted dotted;
    border-radius: 50%;
    display: inline-block;
    position: relative;
    box-sizing: border-box;
    animation: rotation 2s linear infinite;
}
.loader::after {
    content: '';
    box-sizing: border-box;
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;
    border: 3px dotted blue;
    border-style: solid solid dotted;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    animation: rotationBack 1s linear infinite;
    transform-origin: center center;
}

@keyframes rotation {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}
@keyframes rotationBack {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(-360deg);
    }
}