modal with ember-elsewhere

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
	warn: false
});

styles.app.css

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

.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: black;
  opacity: 0.5;
  z-index: 9999;
}
.modal-background {
    background-color: black;
    opacity: 0.5;
    width: 100vw;
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
}

.modal-container {
   width: 100vw;
   height: 100vh;
   position: fixed;
   top: 0;
   left: 0;
   display: flex;
   justify-content: center;
   align-items: center;
}

.modal-dialog {
    background-color: white;
    padding: 1em;
    border-radius: 5px;
    border: 1px solid #B4B4E8;
    position: relative;
    z-index: 1;
}

templates.application.hbs

{{#from-elsewhere name="modal" as |modal|}}
    {{#if modal}}
      <div class="modal-container">
        <div class="modal-background" onclick={{action modal.onOutsideClick}}></div>
        <div class="modal-dialog" >
          {{component modal.body}}
        </div>
      </div>
    {{/if}}
{{/from-elsewhere}}

<p><button {{action (action (mut warn) true)}}>Launch a modal</button></p>
{{#if warn}}
  {{to-elsewhere 
       named="modal" 
       send=(hash body=(component "warning-modal" 
                                  onCancel=(action (mut warn) false))
                                  onOutsideClick=(action (mut warn) false)) }}
{{/if}}

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.6.2",
    "ember-data": "2.7.0",
    "ember-template-compiler": "2.6.2"
  },
  "addons": {
    "ember-elsewhere": "latest"
  }
}

warning-modal.template.hbs

<p>This is a sample warning message!</p>

<button {{action onCancel}}>Close It</button>