body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f9;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 600px;
    margin: 50px auto;
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
}

h1 {
    color: #4CAF50;
}

form input[type="file"] {
    margin-bottom: 10px;
}

button {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}

h3, h4 {
    color: #333;
}

.error {
    color: red;
    font-weight: bold;
}