Cat picture generator

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  w: 100,
  h: 200,
  
  kittehUrl: Ember.computed('w', 'h', function() {
    var { w, h } = this.getProperties(['w', 'h']);
    return `https://placekitten.com/${w}/${h}`;
  })
});

styles.app.css

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

.text-center {
  text-align: center;
  
}

.kitty {
 	border-radius: 5px;
  border: 1px solid black;
  box-shadow: 0 0 40px rgba(0,0,0,0.4);
  margin: 40px;
}

templates.application.hbs

<h1>Welcome to my cat picture generator</h1>
<br>
<br>
{{outlet}}

<p class="text-center">
{{input type='range' min=40 max=300 value=w placeholder="width"}} {{w}}
</p>

<p class="text-center">
{{input type='range' min=40 max=500 value=h placeholder="height"}} {{h}}
</p>

<p class="text-center">
 <img class="kitty" src={{kittehUrl}} />
 <br>
 <input value={{kittehUrl}} style="width: 450px">
</p>
<br>
<br>

twiddle.json

{
  "version": "0.8.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}