* {
    font-family: sans-serif;
    box-sizing: border-box;
    outline: none;
}

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

body {
    display: flex;
    flex-direction: column;
}

body>div {
    margin: 0.5rem 1rem;
    border: 1px solid black;
    background: #eeeeff;
    border-radius: 0.25rem;
    padding: 1rem;
    height: 100%;
    display: flex;
    flex-wrap: wrap;
    align-content: center;
    justify-content: center;
}

h1 {
    text-align: center;
}

div.Card {
    font-family: monospace;
    font-weight: bold;
}

button {
    cursor: pointer;
    margin: 0.25rem;
    padding: 0.25rem;
}

button.Card {
    padding: 1px;
}

button:disabled {
    cursor: not-allowed;
}