*,
::after,
::before{
    box-sizing: border-box;
    color: #fff;
}
body{
    margin: 0;
    padding: 0;
    min-height: 100vh;
    height: auto;
    background: #333;
    display: flex;
    align-items: center;
    justify-content: center;
}
.loader{
    width: 90vmin;
    height: 90vmin;
    display: inline-block;
    position: relative;
    border: 3vmin solid;
    border-radius: 50%;
    border-color: #09e transparent;
    animation: loader 2s linear infinite;
}
span{
    position: absolute;
    font-size: 5vmin;
    color: fuchsia;
    text-shadow: 0 0 5px fuchsia,
                0 0 50px #09e,
                0 0 100px #09e,
                0 0 200px #09e;
    font-weight: 900;
    letter-spacing: 0.2rem;
}
.loader::after{
    content: '';
    position: absolute;
    border-radius: 50%;
    width: 70vmin;
    height: 70vmin;
    margin: auto;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border: 3vmin solid;
    border-color: transparent #e74c3c transparent #e74c3c;
    animation: loaderBack 0.7s linear infinite;
    transform-origin: center center;
}
.loader::before{
    content: '';
    position: absolute;
    border-radius: 50%;
    width: 50vmin;
    height: 50vmin;
    margin: auto;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border: 3vmin solid;
    border-color: #00ff00 transparent;
    animation: loader 0.9s linear infinite;
    transform-origin: center center;
}

@keyframes loader {
    0%{
        transform: rotate(0deg);
    }
    100%{
        transform: rotate(360deg);
    }
}

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