/* Explain: App-specific component classes (add as needed) - piano border added. - */
.piano-border {
    height: 16px;
    background-image: linear-gradient(to right, #000 0%, #000 60%, #fff 60%, #fff 100%);
    background-size: 20px 100%;
    border-top: 2px solid #000;
    border-bottom: 2px solid #000;
    width: 100%;
}