<section>
    <div class="loading">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
    </div>
</section>

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {background: #333;}

section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.loading {
    width: 350px;
    height: 50px;
    display: flex;
    position: relative;
    animation: hue-rotate 4s ease infinite;
}
@keyframes hue-rotate {
    100% {filter: hue-rotate(360deg);}
}

.loading div {
    width: 50px;
    height: 50px;
    position: absolute;
    border-radius: 50%;
    background: rgba(0, 231, 255, 1);
    box-shadow:
        0 0 5px rgba(0, 231, 255, 1),
        0 0 10px rgba(0, 231, 255, 1),
        0 0 20px rgba(0, 231, 255, 1),
        0 0 40px rgba(0, 231, 255, 1),
        0 0 80px rgba(0, 231, 255, .5),
        0 0 160px rgba(0, 231, 255, .2);
}

.loading div:nth-child(1){
    left: 0;
    animation: rotate1 2s ease infinite;
}
@keyframes rotate1 {
    0%,50% {transform-origin: 125px;}
    25% {transform: rotate(180deg);}
    26%,50% {transform: rotate(180deg);}
    50.1%,100% {transform-origin: 175px;}
    100% {transform: rotate(-180deg);}
}

.loading div:nth-child(2){
    left: 100px;
    animation: rotate2 2s ease infinite;
}
@keyframes rotate2 {
    0%,50% {transform-origin: 125px;}
    0%,25% {transform: rotate(0deg);}
    50% {transform: rotate(-180deg);}
    50.1%,100% {transform-origin: 75px;}
    100% {transform: rotate(180deg);}
}

.loading div:nth-child(3){
    left: 200px;
    animation: rotate3 2s ease infinite;
}
@keyframes rotate3 {
    0%,50% {transform-origin: -75px;}
    25% {transform: rotate(180deg);}
    26%,50% {transform: rotate(180deg);}
    50.1%,100% {transform-origin: -25px;}
    100% {transform: rotate(540deg);}
}

.loading div:nth-child(4){
    left: 300px;
    animation: rotate4 2s ease infinite;
}
@keyframes rotate4 {
    0%,50% {transform-origin: -75px;}
    0%,25% {transform: rotate(0deg);}
    50% {transform: rotate(-180deg);}
    50.1%,100% {transform-origin: -125px;}
    100% {transform: rotate(-540deg);}
}