body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f4f4f4;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1, h2, h3 {
    color: #333;
}

form {
    margin: 20px 0;
}

input[type="file"], input[type="number"] {
    margin-right: 10px;
    padding: 5px;
}

button {
    background-color: #007BFF;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

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

button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

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

img {
    margin-top: 20px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

label {
    margin-right: 10px;
}