* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.grid {
    width: 600px;
    border: 1px solid black;
    box-sizing: content-box;
    display: flex;
    flex-wrap: wrap;
}

main>button {
    padding: 0.5rem 1rem;
}