JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app="organHome">
<dl class="sub-nav" ng-controller="inModalSwitchCtrl" ng-init="content=true">
 <dd ng-class="{'bold':content}"><a ng-click="content=true">Contents</a></dd>
 <dd ng-class="{'bold': !content}"><a ng-click="content=false">Comments</a></dd>
</dl>
</div>

CSS

.bold {font-weight: bold}

JavaScript

angular.module('organHome', [])

  .controller('inModalSwitchCtrl', function ($scope) {
           
  });