body {
    font-family: Arial, sans-serif;
    background-color: #f4f6f9;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.container {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    text-align: center;
}
.button-group button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 10px 20px;
    margin: 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.2s;
}
.button-group button:hover {
    background-color: #0056b3;
}
.response-box {
    margin-top: 20px;
    padding: 15px;
    background: #e9ecef;
    border-radius: 4px;
    font-family: monospace;
}