body {
  font-size: 10px;
  line-height: 10px;
  box-sizing: border-box;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  transition: all 0.5s;
}
.container {
  max-width: 1200px;
  padding: 15px;
  text-align: center;
}
#box {
  width: 100%;
  height: 35vh;
  border: 1px solid #000000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2em;
  margin: 10px 0;
}
img {
  border-radius: 50%;
  overflow: hidden;
  margin: 0 15px;
  cursor: pointer;
}
span {
  background-color: #fff;
  padding: 0 10px;
  line-height: 2em;
  margin-bottom: 10px;
}
.audio {
  padding-top: 50px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.volume {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 1.5em;
  line-height: 1.6em;
}
.btn {
  border: none;
  background-color: transparent;
  cursor: pointer;
  border-radius: 50%;
  overflow: hidden;
}
.btn img {
  width: 100px;
}
.btn .play {
  display: block;
}
.btn .stop {
  display: none;
}
.btn.active .play {
  display: none;
}
.btn.active .stop {
  display: block;
}