<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Cube</title>
    <meta name="description" content="Cube — A-Frame Core">
    <link rel="stylesheet" type="text/css" href="../../style/aframe-core.css">
    <link rel="stylesheet" type="text/css" href="../_style/main.css">
    <script src="../../build/aframe-core.js"></script>
  </head>
  <body>
    <a-scene stats="true">

      <!-- Cube -->
      <a-object geometry="primitive: box" material="color: red"
                position="0 0 -20" rotation="0 45 0"></a-object>
    </a-scene>
  </body>
</html>

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Cube</title>
    <meta name="description" content="Cube — A-Frame Core">
    <link rel="stylesheet" type="text/css" href="../../style/aframe-core.css">
    <link rel="stylesheet" type="text/css" href="../_style/main.css">
    <script src="../../build/aframe-core.js"></script>
    <style>
      body { background-color: black; }
    </style>
  </head>
  <body>
    <a-scene stats="true">
      <!-- Cube -->
      <a-object position="0 0 -20" rotation="45 30 0"
                geometry="primitive: box; height: 10; width: 10; depth: 10;"
                material="color: #167341; roughness: 1.0; metalness: 0.2;"></a-object>
    </a-scene>
  </body>
</html>

Make cube example a bit more interesting visually
Make cube example a bit more interesting visually
