body {
    font-family: system-ui, sans-serif;
    background: #202534;
    color: white;
}
main {
    max-width: 700px;
    margin: 2rem auto;
    padding: 0 1rem;
    text-align: center;
}
#klickfeld {
    min-height: 260px;
    display: grid;
    place-items: center;
    border-radius: 18px;
    background: #a73333;
    font-size: 2rem;
    user-select: none;
}
button {
    padding: .7rem 1.2rem;
    margin: .5rem;
    font-size: 1rem;
}