message: MM: minor visual changes
diff: @media (max-width: 820px) {
  display: block;
  -
  - .mode + .mode {
  - margin-left: 0;
  - }
  }
  }
  font-weight: bold;
  }
  .mode-button {
  - margin: 1em auto 0;
  + margin: 1.5em auto 0;
  min-width: 100px;
  display: block;
  }
  