/* PIANO FX */

#piano-container {
   position: relative;
   width: 70%;
   max-width: 1500px;
   min-width: 600px;
   height: auto;
   aspect-ratio: 16/9;
   z-index: 20;
   background-size: cover;
 }
.key {
   position: absolute;
   bottom: 0%;
   width: 8%;
   height: 100%;
   cursor: pointer;
   opacity: 0;
   z-index: 22;
 }
 
 .key.black {
   height: 30%;
   width: 5%;
   z-index: 25;
 }