message: Fix the sidebar height
  `calc` is parsed specially in SASS as if the interior is a plain unquoted string and requires using explicit interpolation syntax (see the "fun fact" at https://sass-lang.com/documentation/at-rules/function#plain-css-functions).
diff: .sidebar {
  margin-top: 0;
  top: $top-navbar-height;
  - height: calc(100vh - $top-navbar-height);
  + height: calc(100vh - #{$top-navbar-height});
  /* Since we use `overflow-wrap: anywhere;`, we never have the need for a X scrollbar... */
  overflow-x: hidden;
  