Hover thinger

components.item-row\.js

import Component from '@glimmer/component';
import { action } from '@ember/object';

export default class ItemRow extends Component {}

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

styles.app\.css

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

.item-row {
  border: 1px solid gray;
  border-radius: 5px;
  margin-bottom: 10px;
}

.item-row__content {
	/* Must not have background-color */
  display: flex;
  justify-content: space-between;
  padding: 25px;
  position: relative;
}

.item-row__hoverable::before {
  content: '';
  opacity: 0;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  position: absolute;
  transition: opacity 333ms;
	z-index: -1;
}

.item-row__hoverable:hover::before {
  opacity: 1;
}

.item-row__hoverable--primary:hover::before {
  background-color: pink;
}

.item-row__hoverable--secondary:hover::before {
  background-color: white;
}

.item-row__trigger:hover {
  background-color: red;
}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>

<ItemRow>1</ItemRow>

<ItemRow>2</ItemRow>

<ItemRow>3</ItemRow>

templates.components.item-row\.hbs

<div class="item-row">
	<div class="
  	item-row__content
    item-row__hoverable
    item-row__hoverable--primary
  ">
		<div class="item-row__yield">{{yield}}</div>
  
  	<div class="
    	item-row__hoverable
      item-row__hoverable--secondary
    ">
	  	<button class="item-row__trigger">
  			Hoverable targer
	  	</button>
  	 </div>
   </div>
</div>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}