Модуль:Key/styles.css

.keyboard-key {
	padding: 0.25em 0.5em;
	display: inline-block;
    line-height: 1;
    font-weight: normal;
    font-size: 0.875rem;
    border-radius: 30px;
    border: 1px solid;
    border-color: yellow;
    background: red;
    color: blue;
}