body {
    font-family: Arial, sans-serif;
}

#popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

#popup-content {
    background-color: #ffffff;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    width: 300px;
    position: relative;
}

#udemy-logo {
    width: 120px;
    margin-bottom: 20px;
}

#course-link {
    display: inline-block;
    background-color: #a435f0;
    color: #fff;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
    margin: 10px 0;
}

#course-link:hover {
    background-color: #9b30e9;
}

#countdown {
    font-size: 18px;
    color: #a435f0;
    margin: 10px 0;
}

#close-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
}