Fixes #1588: Remove overflow: hidden rule

website/playground/playground-runner.html

@@ -8,7 +8,6 @@
 
 	<style type="text/css">
 		body { margin: 0; padding: 0; border: 0; }
-		.monaco-editor { overflow: hidden; }
 	</style>
 
 	<script>var require = { paths: { 'vs': '../../release/dev/vs' } };</script>