ul {
 display: flex; 
 list-style: none;
 justify-content: center;
}

/* white keys */
ul .key {
  position: relative;
  width: 60px;
  height: 180px;
  border: 1px solid black;
  cursor: pointer;
  display: flex;
  background: cornsilk;
  justify-content: center;
  align-items: flex-end;
  border-radius: 5px;
}

/* black keys */
ul .black-key {
 	position: absolute; 
 	width: 45px;
  left: 20.5px;
  bottom: 60px;
  height: 120px;
  display: flex;
  background: black;
  color: white;
  justify-content: center;
  border-radius: 5px;
  align-items: flex-end;
}
  
body {
background-color: lightblue;
  
}
 
li:hover{
  background-color: snow;
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
}