body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

header {
    background-color: #333;
    padding: 10px 0;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    text-align: center;
}

nav ul li {
    display: inline;
    margin-right: 20px;
}

nav ul li a {
    text-decoration: none;
    color: #fff;
    font-weight: bold;
}

#download-container {
    text-align: center;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    margin: 20px auto;
    max-width: 600px; /* Adjust as needed */
}

h1 {
    color: #333;
}

#progress-container {
    margin-top: 20px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: #fff;
}

#progress-bar {
    height: 20px;
    width: 0;
    background-color: #4caf50;
    border-radius: 4px;
    transition: width 0.3s ease-in-out;
}

#progress-text {
    margin-top: 10px;
    text-align: center;
    color: #555;
}

#download-btn {
    display: block;
    width: 100%;
    padding: 10px;
    margin-top: 20px;
    background-color: #4caf50;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease-in-out;
}

#download-btn:hover {
    background-color: #45a049;
}

#download-btn:active {
    background-color: #3d8b40;
}

#download-btn:disabled {
    background-color: #ddd;
    cursor: not-allowed;
}

#completion-message {
    margin-top: 20px;
    text-align: center;
    color: #4caf50;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px;
    position: fixed;
    bottom: 0;
    width: 100%;
}

/* Media Queries for responsiveness */
@media only screen and (max-width: 600px) {
    #download-container {
        margin: 10px;
    }

    nav ul {
        flex-direction: column;
    }

    nav ul li {
        display: block;
        margin: 10px 0;
    }
}