<html ng-app="theApp">
  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.2.13/angular.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-router/1.0.0/angular-ui-router.js"></script>
    <script src="stateController.js"></script>
    <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Source+Sans+Pro">
    <font face="Source Sans Pro">
  </head>

  <body ng-controller="stateController">
    <div class="container-fluid">
      <center>
        <br><br>
        <button ui-sref="home"><b> Home </b></button>
        <button ui-sref="about"><b> About </b></button>
      </center>
      <div ui-view></div>
    </div>
  </body>
</html>
<div class="container">
  <center>
    <h1> Hello user1902160! </h1>
    <h2> This is your <u>home</u> page! </h2>
    <h3> Show the world what you're made of! </h3>
  </center>
</div>
var app = angular.module('theApp', ['ui.router']);

app.run(['$state', function($state) {
  $state.transitionTo('home');
}]);

app.controller('stateController', function($scope, $state) {
  $scope.$state = $state;
});

app.config(function($stateProvider) {
  $stateProvider
    .state('home', {
      url: '/home',
      templateUrl: 'home.html'
    })
    .state('about', {
      url: '/about',
      templateUrl: 'about.html'
    })
});
<div class="container">
  <center>
    <h1> Hello again user1902160! </h1>
    <h2> This is your <u>about</u> page! </h2>
    <h3> Write stories about yourself! </h3>
  </center>
</div>