simplify width/height

webfront/pages/index.html

@@ -10,9 +10,7 @@
         <script async type="module" src="main.js"></script>
     </head>
     <body>
-        <div class="canvas">
-            <canvas id="glCanvas"></canvas>
-        </div>
+        <canvas id="glCanvas"></canvas>
         <div class="vertical-menu" id="menu">
             <div class="menu-item">
                 <p class="menu-header">Choose an equation set</p>