message: Fix z-index of sidebar and navigation bg color
diff: @@ -54,8 +54,8 @@ div.rustdoc {
  }
  .sidebar {
  - top: 32px;
  - left: 0;
  + padding-top: 32px;
  + z-index: -1;
  }
  body {
  @@ -115,6 +115,7 @@ div.container-rustdoc {
  div.nav-container {
  height: 32px;
  border-bottom: 1px solid $color-border;
  + background-color: #fff;
  li {
  border-left: 1px solid $color-border;
  