.invalid {
    width: 100%;
    margin-top: .25rem;
    font-size: .875em;
    color: #dc3545;
}

.nlx-preview {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
}

.nlx-preview-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #000;
    opacity: 0.6;
}

.nlx-preview > .card {
    height: 70%;
    width: 80%;
    left: 10%;
    top: 15%;
}

.course-card .card-text {
    font-size: 0.8em;
}

.nlx-promote-video-container {
    height: 600px;
    margin-bottom: 20px;
}

@media (max-width: 992px) {
    .nlx-promote-video-container {
        height: 350px;
        margin-bottom: 25px;
    }
}

@media (max-width: 768px) {
    .nlx-promote-video-container {
        height: 200px;
        margin-bottom: 25px;
    }

    .nlx-header-menu {
        justify-content: center !important;
    }

    main {
        margin-top: 114px;
    }
}