@media screen and (min-width: 600px) {
  .container {
    width: 600px;
    margin: 0;
  }
}
@media screen and (max-width: 600px) {
  .container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
  }
}
.root {
  width: 100%;
  text-align: center;
}
div + div {
  margin-top: 10px;
}
h1 {
  font-size: 52px;
}
input, audio {
  width: 100%;
  font-size: 24px;
}
.buttons {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
}
.speed {
  display: flex;
  flex-direction: row;
  justify-content: center;
}
button {
  display: flex;
  height: 50px;
  width: 100px;
  font-size: 24px;
  background-color: lightgrey;
  margin: 5px 5px;
  outline: none;
}
label {
  flex: 1;
}