.title {
 display: flex;
 justify-content: center;
 align-items: center; 
}

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

ul .key {
  position: relative;
  width: 60px;
  height: 180px;
  border: 1px solid black;
  cursor: pointer;
  display: flex;
  background: #fffff0;
  justify-content: center;
  align-items: flex-end;
  border-radius: 5px;
}

ul .black-key {
     position: absolute; 
     width: 45px;
  left: 20px; 
  height: 120px;
  display: flex;
  background: black;
  color: white;
  justify-content: center;
  border-radius: 5px;
  align-items: flex-end;
  top:0
}