#SelectiveCourseSelection.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 10000;
    display: flex;
    justify-content: center;
    align-items: center;
}

#SelectiveCourseSelection .popup-content {
    background-color: #212426; /* Dark background matching the theme */
    padding: 40px;
    border-radius: 8px;
    text-align: center;
    max-height: 80vh;
    width: 90%;
    max-width: 800px;
    overflow-y: auto;
    overflow-x: hidden;
    border: 1px solid rgba(255, 255, 255, 0.15);
    position: relative;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

#SelectiveCourseSelection .close-popup-button {
    margin-top: 20px;
    cursor: pointer;
    border: 1px solid rgba(255, 255, 255, 0.5);
    padding: 10px 20px;
    display: inline-block;
    border-radius: 4px;
    transition: background-color 0.2s;
    user-select: none;
}

#SelectiveCourseSelection .close-popup-button:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

#SelectiveCourseSelection select {
    width: 100%;
    background-color: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.3);
    margin-bottom: 10px;
}

#SelectiveCourseSelection option {
    background-color: #212426;
    color: #ffffff;
}

#SelectiveCourseSelection h3 {
    margin-bottom: 20px;
    font-size: 1.5em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
    display: block;
}

#SelectiveCourseSelection .selectiveCourseWarning {
    color: #ffaaaa;
    font-size: 0.9em;
    margin-top: 10px;
}