body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    width: 80%;
    max-width: 900px;
    background-color: white;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    overflow: hidden;
}

.heading-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    background-color: #f8f9fa;
    border-bottom: 1px solid #ddd;
}

.back-button {
    background-color: #6c757d;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.back-button:hover {
    background-color: #5a6268;
}

.video-heading {
    font-size: 24px;
    color: #333;
    margin: 0;
    flex-grow: 1;
    text-align: center;
}

.video-container {
    width: 100%;
    position: relative;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.buttons-container {
    display: flex;
    justify-content: space-between;
    padding: 20px;
}

.nav-button {
    background-color: #007BFF;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.nav-button:hover {
    background-color: #0056b3;
}

.complete-button {
    background-color: #28a745;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.complete-button:hover {
    background-color: #218838;
}

@media (max-width: 768px) {
    .buttons-container {
        flex-direction: column;
        align-items: center;
    }

    .nav-button,
    .complete-button {
        width: 100%;
        margin-bottom: 10px;
    }
}