body {
    background: rgba(0, 0 , 0, 255);
}

.loader {
    width: 48px;
    height: 48px;
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    border: 5px solid rgba(255, 255, 255, 255);
    border-bottom-color: transparent;
    border-radius: 50%;
    animation: rotation 1s linear 1s infinite;
    visibility: hidden;
    margin: auto;
}

@keyframes rotation {
    0% {
        visibility: visible;
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}