body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f2f2f2;
}
h1 {
    text-align: center;
    margin-bottom: 30px;
}
h2 {
    text-align: center;
    margin-bottom: 20px;
}
h3 {
    text-align: center;
    margin-bottom: 10px;
}
.button-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    justify-content:space-between;
    gap: 10px;
}