button[data-keyboard-target="key"].right-pos {
    background: green;
}

button[data-keyboard-target="key"].right-char {
    background: yellow;
}

button[data-keyboard-target="key"].miss {
    background: grey;
}


div.playfield div.row span {
    display: inline-block;
    border: solid thin gray;
    
    height: 1.1em;
    width: 1.1em;
}

div.playfield div.row span.right-pos {
    background: green;
}

div.playfield div.row span.right-char {
    background: yellow;
}

div.playfield div.row span.miss {
    background: grey;
}