New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

styles.app.css

html {
  height: 100%;
}

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
  height: 100%;
}

.ember-application {
  height: 100%;
}

.ember-application > .ember-view {
  height: 100%;
  position: relative;
  display: flex;
  flex-direction: column;
}

.app-bar {
  height: 50px;
  width: 100%;
  background-color: blue;
}

.content {
  flex: 1;
  background-color: red;
}

templates.application.hbs

<div class='app-bar'></div>
<div class='content'>
{{outlet}}
</div>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}