Changing button colors dynamically

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Changing button colors dynamically'
});

styles.app.css

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

.coloredBox {
	color: red;
  border-color: red;
}

.button {
  border-width: 2px;
  border-style: solid;
  border-color: inherit;
  background-color: transparent;
  
  padding: 1em;
  color: inherit;
  text-decoration: none;
}

.button:hover {
  background-color: currentColor;
  color: inherit;
}

.button:hover .message {
  color: black;
}

templates.application.hbs

<h1>{{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>
<div class="coloredBox">
{{#link-to "index" class="button"}}<span class="message">Example Text</span>{{/link-to}}
</div>

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.8.0",
    "ember-data": "2.8.0",
    "ember-template-compiler": "2.8.0",
    "ember-testing": "2.8.0"
  },
  "addons": {}
}