@media screen and (min-width: 880px) {
  /* Main menu is in the left sidebar when page is wide enough. */
  #ham-toggle {
    display: none;
  }

  .container {
    margin: 1em 220px;
  }
}

@media screen and (max-width: 879px) {
  #site-logo {
    visibility: hidden;
  }

  #left-column {
    display: none;
  }

  #right-column {
    display: none;
  }
}