message: feat(nav-bar-functionality): add left border to nav in panel
diff: margin-top: 0px !important;
  }
  .ms-Nav-compositeLink {
  + a {
  + border-left: $pivotItemLeftBorderWidth $pivotItemBorderStyle $neutral-0;
  + border-top: 0px;
  + border-bottom: 0px;
  + }
  .ms-Button-label {
  color: $neutral-100;
  }
  &.is-selected {
  a {
  background-color: $communication-tint-40;
  + border-left: $pivotItemLeftBorderWidth $pivotItemBorderStyle
  + $communication-primary;
  }
  a::after {
  border-left: 0px;
  