/*
* Physics
*/
.next-physics{
    position: relative;
    z-index: 1;

    width: 100%;
    height: 500px;

    --background-color: red;
}
.next-physics canvas{
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;

    background-color: var(--background-color) !important;
}