body {
  margin: 40px auto;
  max-width: 650px;
  line-height: 1.6;
  font-size: 18px;
  color: #444;
  padding: 0 10px;
}

h2 {
  padding-top: 1em;
  line-height: 1.2;
}

p {
  text-align: justify;
}

p.centered {
  text-align: center;
}

.audio-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.audio-container code {
  margin: auto;
}

audio {
  margin: 5px;
}

audio.long {
  width: 100%;
}

@keyframes fadeIn {
  0% {
    opacity: 0;
    transform: translateX(256px);
  }
  100% {
    opacity: 1;
  }
}

.fade-in {
  animation: fadeIn 1.2s;
}