section {
  width: 80%;
  max-width: 800px;
  margin: 80px auto 0;;
}

video {
  margin: 10px 0;
  width: 100%;
  border: 2px solid #000;
}

video.active {
  border: 5px solid red;
}

button {
  margin: 0 5px 0 0;
  padding: 5px;
  cursor: pointer;
}

.disabled {
  pointer-events: none;
}

.hidden {
  display: none;
}