message: fix the styling of footer copy on mobile
diff: @@ -1088,6 +1088,13 @@ code {
  .nav-footer .copyright {
  width: 600px;
  color: #fff;
  - margin: auto;
  + margin: 0 auto;
  font-size: 10pt;
  }
  +
  +@media only screen and (max-width: 485px) {
  + .nav-footer .copyright {
  + width: auto;
  + margin: 0 1.5em;
  + }
  +}
  