@charset "utf-8";
* {
  box-sizing: border-box;
}
body {
  padding: 6rem;
  text-align: center;
  background-color: #fcfcfc;
}
.piano {
  width: 70%;
  margin: auto;
}
#displayArea {
  background-color: #eee;
  height: 150px;
  width: 50%;
  margin: auto;
  line-height: 150px;
  font-size: 3rem;
  margin-bottom: 2rem;
}
#autoArea {
  height: 25px;
}

/* 鍵盤 */
.flex {
  display: flex;
  justify-content: space-between;
  margin-bottom: 4rem;
  width: 100%;
}
.pianoKey {
  font-size: 2rem;
  background-color: #fff;
  color: #000;
  width: 100%;
  height: 130px;
  line-height: 130px;
  box-shadow: 0 2px #333;
  border: 2px #000 solid;
  border-right: none;
  cursor: pointer;
  user-select: none;
}
.pianoKey:last-child {
  border-right: 2px solid #000;
}
.pianoKey:active {
  box-shadow: none;
  translate: 0 2px;
  background-color: #ff7070;
}
.color {
  box-shadow: none;
  translate: 0 2px;
  background-color: #ff7070;
}

/* オートボタン */
#autoBtn {
  width: 200px;
  margin: auto;
}
#button {
  background-color: #eee;
  width: 100%;
  padding: 1rem;
  border: 1px solid #aaa;
  cursor: pointer;
  display: inline-block;
}
#button:hover {
  background-color: #ddd;
}