body.loading {
    overflow: hidden;
}

body.loading #loader {
    display: initial;
}
#loader {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 1100;
    background: rgba(0, 0, 0, 0.2);
}
#loader .d-flex {
    height: 100%;
}
#loader .spinner-border {
    width: 4rem;
    height: 4rem;
}