html
{
    overflow-y:hidden;
    overflow-x:hidden;
}

.preloader
{
    position: fixed;
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: black;
    z-index: 1000;
}