body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: black;
    overflow: hidden;
}

.loader,
.loader span {
    width: 10em;
    height: 10em;
    border: 0.25em solid white;
    font-size: 10px;
    border-radius: 1em;
    position: absolute;
    mix-blend-mode: screen;
}

.loader {
    background-color: gold;
    animation: rotating 2s linear infinite;
}

@keyframes rotating {
    to {
        transform: rotate(1turn);
    }
}

.loader span {
    animation: de-rotating 4s linear infinite;
}

@keyframes de-rotating {
    from, to {
        transform: rotate(0deg) scale(0.5);
    }

    50% {
        transform: rotate(-180deg) scale(1.2);
    }
}

.loader span:nth-child(1) {
    top: 5em;
    left: 5em;
    background-color: dodgerblue;
}

.loader span:nth-child(2) {
    top: -5em;
    left: 5em;
    background-color: hotpink;  
}

.loader span:nth-child(3) {
    top: 5em;
    left: -5em;
    background-color: mediumpurple;
}

.loader span:nth-child(4) {
    top: -5em;
    left: -5em;
    background-color: limegreen;
}