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

.loader {
    width: 10em;
    height: 10em;
    font-size: 30px;
    box-sizing: border-box;
    border-top: 0.3em solid hotpink;
    border-radius: 50%;
    position: relative;
    animation: rotating 2s linear infinite;
}

.loader::before,
.loader::after {
    content: '';
    position: absolute;
    width: inherit;
    height: inherit;
    border-radius: 50%;
    box-sizing: border-box;
    top: -0.2em;
}

.loader::before {
    border-top: 0.3em solid dodgerblue;
    transform: rotate(120deg);
}

.loader::after {
    border-top: 0.3em solid gold;
    transform: rotate(240deg);
}

.loader span {
    position: absolute;
    color: white;
    width: inherit;
    height: inherit;
    text-align: center;
    line-height: 10em;
    font-family: sans-serif;
    animation: rotating 2s ease-in-out infinite reverse;
}

@keyframes rotating {
    33% {transform: rotate(0.33turn);}
    66% {transform: rotate(0.66turn);}
    100% {transform: rotate(1turn);}
}