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

header {
    width: 100%;
    background-color: #007bff;
    color: white;
    text-align: center;
    padding: 20px;
    position: fixed;
    top: 0;
    z-index: 10;
    padding: 1rem;
}

header nav {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem;
}

header nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    background-color: #333;
    border-radius: 5px;
}

header h1 {
    margin: 0;
}

video {
    width: 100%;
    max-width: 600px;
    margin-top: 80px; /* To avoid overlap with header */
}

button {
    position: fixed;
    bottom: 30px;
    padding: 10px 20px;
    font-size: 18px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

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

@media (max-width: 600px) {
    .container {
        padding: 0.5rem;
    }
    header nav a {
        font-size: 0.8rem;
    }
}

@media (max-width: 768px) {
    video {
        max-width: 100%;
        height: auto;
    }
}

@media (max-width: 480px) {
    button {
        width: 80%;
        bottom: 20px;
    }
}