#jp-grammar-root {
    font-family: 'Segoe UI', sans-serif;
    text-align: center;
    margin-top: 20px;
    padding: 10px;
}

.button {
    margin: 5px;
    padding: 10px 20px;
    font-size: 16px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    display: inline-block;
}

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

.button.back {
    background-color: #555;
}

@media screen and (max-width: 600px) {
    .button {
        font-size: 14px;
        padding: 8px 16px;
    }
}