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

.container {
    max-width: 800px;
    margin: 20px auto;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h2, h3 {
    color: #333;
    text-align: center;
}

form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

form input, form button {
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

form button {
    background: #007bff;
    color: white;
    cursor: pointer;
    font-size: 16px;
}

form button i {
    margin-right: 5px;
}

form button:hover {
    background: #0056b3;
}

.certificados {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.certificado {
    background: #f9f9f9;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
}

.certificado p {
    margin: 5px 0;
}

.certificado form button {
    background: #28a745;
    color: white;
    font-size: 14px;
}

.certificado form button:hover {
    background: #218838;
}

.error {
    color: red;
    text-align: center;
}