.loader{
    width: 100%;
    height: 100%;
    background-color: white;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 99;
    display: flex;
    justify-content: center;
    align-items: center;
}

.loader.hidden{
    opacity: 0;
    visibility: hidden;
}