body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f4f4f9;
}

#app {
    text-align: center;
}

button {
    padding: 15px 30px;
    font-size: 18px;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

button:active {
    transform: scale(0.98);
}