:root {
    --green:    #b8f959;
    --black:    #000;
    --black2:     #111111
}

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

body {
    background: var(--black);
    font-family: system-ui, Segoe UI, Roboto, Arial
}

#game {
    display: block
}

.controls {
    position: fixed;
    top: 10px;
    left: 10px;
    z-index: 20
}

.controls button {
    padding: 8px 12px;
    border-radius: 6px;
    border: 0;
    background: var(--green);
    color: var(--black2);
    cursor: pointer
}