html,
body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, system-ui, BlinkMacSystemFont, 'Segoe UI', Roboto,
        'Helvetica Neue', Arial, sans-serif;
    height: 100%;
    min-height: 100%;
    min-width: 100%;
    width: 100%;
}

.root {
    height: 100%;
    width: 100%;
    color: #FFFFFF;
    background-color: #607D8B;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    font-size: 300%;
}

.span {
    padding: 5px;
}

.button {
    margin: 4px;
    border-radius: 3px;
    padding: 10px;
    cursor: pointer;
    text-transform: uppercase;
    text-decoration: none !important;
    user-select: none;
}

.bottom-button {
    position: absolute;
    bottom: 8px;
    font-size: 0.5em;
}