.course_header {
    background-color: var(--bs-body-bg);
    position: sticky;
    width: 100%;
    top: 0;
}

.course_header .navbar-brand image {
    max-width: 50px;
    height: 50px;
    min-height: 50px;
}

.course_header a {
    font-size: 16px;
    font-weight: 600;
}