#preloader {
    width:100%;
    height:100%;
    position: fixed;
    top:0;
    background-color: black;
    z-index:10000;
    transition:0.5s;
    text-align:center;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}
#preloader img {
    width: 200px;
    height: auto;
}