Turn off spell check in playground block explorer; increase font size.

playground/index.html

@@ -10,7 +10,7 @@
     <div id="vm-devtools">
         <div id="tab-blockexplorer">
             <h2>VM Block Representation</h2>
-            <textarea id="blockexplorer"></textarea>
+            <textarea id="blockexplorer" spellcheck="false"></textarea>
         </div>
     </div>
     <div id="blocks"></div>

playground/playground.css

@@ -25,4 +25,5 @@ body {
     background: rgb(36,36,36);
     color: rgb(217,217,217);
     font-family: monospace;
+    font-size: 10pt;
 }