.foil {
    background: linear-gradient(-45deg, #ff00001a, #0000ff42, #ff000052, #00ff0045, #ff00001a, #ff00001a, #0000ff52, #ff000052, #00ff0045, #ff00001a);
    background-position: 0 0;
    background-size: 900px;
    animation: foil 4s infinite alternate;
    display: inline-block;
    position: absolute;
    height: auto;
    width: auto;
    left: 0;
    top: 0;
    z-index: 100;
    margin: auto;
    right: 0;
    bottom: 0;
    border-radius: 4px;
    transform: scale(0.7);
}
@keyframes foil {
    100% {
        background-position: -200px 0;
    }
}
.foil.none {
    animation: none;
    display: none;
}

@media (max-width: 767px) {
    .foil {
        height: calc(100% + 113px);
        border-radius: 20px;
/*
        border: 4px solid white;
        box-shadow: 0 0 0px 4px white;
*/
    }
}

@media (max-width: 500px) {
    .foil {
        height: calc(100% + 88px);
    }
}