.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #fff; /* or any other background color */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000; /* make sure it's on top of everything */
}

.preloader video {
    width: 70%;
    height: 70%;
    object-fit: contain;
}