#loader {
    position: fixed;
    z-index: 5000000;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, .8);
}

.loader {
    position: fixed;
    border-radius: 50%;
    animation: spin .5s cubic-bezier(0.25, 0.46, 0.45, 0.94) infinite
}

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