* {
  margin: 0;
  padding: 0;
  font-family: "Ubuntu", sans-serif;
}

body {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  margin-top: 100px;
  width: 80%;
  min-width: 800px;
  height: 70%;
  min-height: 400px;
  display: flex;
  position: relative;
}
.container .audio-list {
  width: 20%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
}
.container .audio-list .audio {
  width: 120px;
  height: 60px;
  background-color: #eee;
  border-radius: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.container .audio-list .audio:hover {
  cursor: pointer;
}
.container .audio-board {
  width: 80%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
}
.container .audio-board .title {
  width: 100%;
  position: absolute;
  top: -80px;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.container .audio-board .title h1 {
  display: block;
  padding: 10px 40px;
  color: #fff;
  background-color: #f78259;
  width: 60%;
}
.container .audio-board .title p {
  display: block;
  padding: 10px 40px;
  color: #000;
  background-color: #fff;
}
.container .audio-board .play-btn {
  width: 100%;
  position: absolute;
  bottom: -80px;;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.container .audio-board .play-btn .btn {
  display: block;
  width: 60px;
  height: 60px;
  background-color: #f78259;
  border-radius: 50%;
  position: relative;
}
.container .audio-board .play-btn .btn:hover {
  cursor: pointer;
}
.container .audio-board .play-btn .play {
  display: block;
}
.container .audio-board .play-btn .play:before {
  content: "";
  width: 0;
  height: 0;
  position: absolute;
  top: 15px;
  left: 22px;
  border-top: 15px solid transparent;
  border-left: 20px solid #fff;
  border-bottom: 15px solid transparent;
}
.container .audio-board .play-btn .stop {
  display: none;
}
.container .audio-board .play-btn .stop:before {
  content: "";
  width: 24px;
  height: 24px;
  background-color: #fff;
  position: absolute;
  top: 18px;
  left: 18px;
}
.container .audio-board .play-btn .not-active {
  opacity: 0.5;
}
.container .audio-board .play-btn .not-active:hover {
  cursor: default;
}
.container .audio-board .column {
  width: 100%;
  display: flex;
  justify-content: space-around;
}
.container .audio-board .column .square {
  width: 55px;
  height: 55px;
  transition: all 0.2s;
}
.container .audio-board .column .square:hover {
  cursor: pointer;
}
.container .audio-board .column .active-btn {
  transform: scale(1.2);
}
.container .audio-board .column .tom {
  background-color: #00b7d4;
  opacity: 0.3;
}
.container .audio-board .column .clap {
  background-color: #ff80ff;
  opacity: 0.3;
}
.container .audio-board .column .kick {
  background-color: #cde800;
  opacity: 0.3;
}
.container .audio-board .column .hat {
  background-color: #7659f7;
  opacity: 0.3;
}
.container .audio-board .column .boom {
  background-color: #ff962e;
  opacity: 0.3;
}
.container .audio-board .column .ride {
  background-color: #20e381;
  opacity: 0.3;
}
.container .audio-board .column .snare {
  background-color: #1d56b8;
  opacity: 0.3;
}
.container .audio-board .column .play {
  opacity: 1;
}