body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
}

.container {
    background-color: #fff;
    max-width: 400px;
    margin: 0 auto;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
}

h1 {
    text-align: center;
}

label {
    font-weight: bold;
}

input[type="file"] {
    width: 100%;
    margin-top: 5px;
}

button {
    margin-top: 10px;
}

#message {
    text-align: center;
    margin-top: 10px;
    color: #008000;
}