#content-loader {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: #1b2227;
    overflow: hidden;
    z-index: 16777270;
}

.loader {
    width: 48px;
    height: 48px;
    border: 3px solid #fff;
    border-radius: 50%;
    display: inline-block;
    position: relative;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
    top: calc(50% - 28px);
    left: calc(50% - 28px);
}

.loader::after {
    content: '';
    box-sizing: border-box;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 56px;
    height: 56px;
    border-radius: 50%;
    border: 3px solid;
    border-color: #54a8e4 transparent;
}

@keyframes rotation {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}