QUnit: Use monospace font for npm/bower install commands

Author: jzaefferer

themes/qunitjs.com/style.css

@@ -20,9 +20,11 @@ a {
 }
 
 .download-box .copyable {
-	width: 14em;
+	width: 20em;
 	max-width: 100%;
 	padding: 2px 5px;
 	border: 1px solid #e4e4e4;
 	border-radius: 5px;
+	text-align: center;
+	font-family: monospace;
 }