:root {
  color: #17202a;
  font-family: system-ui, sans-serif;
  background: #f7f8fa;
}

body {
  margin: 0;
}

main {
  box-sizing: border-box;
  max-width: 760px;
  margin: 0 auto;
  padding: 24px;
}

button {
  padding: 10px 16px;
  font: inherit;
}

section {
  margin-top: 28px;
}

.video-frame,
canvas {
  display: block;
  width: min(100%, 320px);
  min-height: 240px;
  overflow: hidden;
  border: 3px solid #2878c8;
  background: #222;
}

video,
canvas {
  max-width: 100%;
}

pre {
  overflow: auto;
  padding: 12px;
  border: 1px solid #c9ced6;
  background: #fff;
  white-space: pre-wrap;
}