indexx.html

<link rel="stylesheet" href="assets/css/index.css" />
<link rel="stylesheet" href="assets/trd-party/colpick/colpick.css" />
<div id="stage">
  <canvas id="ui-layer" width="480" height="320"></canvas>
  <canvas id="game-layer" width="480" height="320"></canvas>
  <canvas id="background-layer" width="480" height="320"></canvas>
</div>
<input type="color" id="example-color" value="#FF0000">
<button id="mover">Move</button>
<button id="green">Green</button>
<button id="createnew">New</button>
<button id="removenew">Remove</button>
<button id="rectangle">Rectangle</button>
<button id="circle">Circle</button>
<script src="assets/trd-party/jquery/jquery-3.5.1.slim.min.js"></script>
<script src="assets/trd-party/colpick/colpick.js"></script>
<script src="assets/js/libs.js"></script>
<script src="assets/js/index.js"></script>