.container {
  margin-top: 1em;
}

h5, p {
  margin-top: 0.5em;
}

label {
  display: inline-block;
}

.viewport {
  display: inline-block;
  position: relative;
}

img, video, #note {
  display: none;
  max-width: 100%;
}

#imgUrl {
  width: 25em;
  max-width: 100%;
}

#imgUrl.active {
  color: #ffffff;
  background-color: #33C3F0;
}

#imgUrl.active ~ .viewport > #img,
#imgUrl.active ~ #note,
#imgBtn.button-primary ~ .viewport > #img,
#videoBtn.button-primary ~ .viewport > #video {
  display: block;
}

#canvas {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}

#encoding {
  margin-right: 1em;
}

pre {
  font-size: 1.35rem;
  white-space: pre-wrap;
  word-wrap: break-word;
}