Module:Key/styles.css

.keyboard-key {
	padding: 0.25em 0.5em;
	display: inline-block;
    line-height: 1;
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: 8px;
    border: 1px solid;
    border-color: grey;
    background: var( --color-surface-3 );
    color: white;
}