html,
body {
    height: 100%;
    width: 100%;
    margin: 0;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    gap: 5px;
}

#number {
    border-radius: 1rem;
    border: none;
    outline: none;
    padding: 5px;
    width: max(10rem, 20vw);
}