html,
body {
  font-family: sans-serif;
}

body {
  display: grid;
  place-items: center center;
}

h4 code {
  font-size: 1.5em;
}

code {
  background: #f2f4f4;
  border-radius: 5px;
  padding: 3px 5px 3px 5px;
}

.container {
  width: 60em;
}

.nav {
  font-size: 1.5rem;
  display: flex;
  flex-direction: row;
}
.nav .wide {
  flex: 1;
  font-weight: bold;
}

.split {
  display: grid;
  grid-template-columns: 16em auto;
}

video {
  width: 100%;
}

@media screen and (max-width: 58em) {
  .split {
    display: flex;
    flex-direction: column;
  }

  .container {
    width: calc(100% - 2em);
    margin: 1em;
  }
}