.hero-image {
    height: 320px;
    background-image: url("https://cdn-icons-png.flaticon.com/512/2920/2920320.png");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}
#materials-container .material-item {
    display: flex;
}
#materials-container .material-item .card {
    display: flex;
    flex-direction: column;
    width: 100%;
}
#materials-container .material-item .card .card-body {
    display: flex;
    flex-direction: column;
    flex: 1 1 auto;
}
#materials-container .material-item .card .card-body p {
    overflow: hidden;
}
.dragging {
    opacity: 0.5;
}
.drop-zone {
    position: relative;
    min-height: 70px;
}
.drop-zone.over {
    background-color: rgba(13, 110, 253, 0.05);
    border-color: #0d6efd !important;
}
.drop-indicator {
    position: absolute;
    top: -2px;
    left: 0;
    right: 0;
    height: 3px;
    background-color: #0d6efd;
    border-radius: 2px;
    z-index: 1;
    display: none;
}
.drop-zone.over-top .drop-indicator {
    top: -2px;
    display: block;
}
.drop-zone.over-bottom .drop-indicator {
    top: auto;
    bottom: -2px;
    display: block;
}
.preview-icon-btn {
    padding: 0.25rem;
    line-height: 1;
}