.formset-card.hidden {
    display: none;
}

#preview {
    position: relative;
    border: 1px solid #ccc;
    overflow: hidden;
}
.element-preview {
    position: absolute;
    padding: 5px;
    background-color: #f0f0f0;
    border: 1px solid #ddd;
}
.invert-contrast {
    background-color: #000;
    color: #fff;
}