Minor changes

index.html

         <li>
             <strong>color</strong>
             Name of the card color. You can use all <a href="http://www.w3schools.com/cssref/css_colornames.asp">CSS color names</a>.
-            Additional custom colors are defined in <i>css/custom-colors.css</i>.
+            Additional custom colors are defined in <code>css/custom-colors.css</code>.
         </li>
         <li>
             <strong>icon</strong>
             Name of the card icon. You can use all icons from <a href="http://game-icons.net/">game-icons.net</a>.
             For example, the file name of <a href="http://game-icons.net/lorc/originals/plain-dagger.html">this dagger</a>
             is "plain-dagger.png", so you would use "plain-dagger" as the icon name.
-            Additional custom icon names are defined in <i>css/custom-icons.css</i>.
+            Additional custom icon names are defined in <code>css/custom-icons.css</code>.
         </li>
         <li>
             <strong>back_icon</strong>
 
 <p>
     Each card element is a string of the following format:
-    <pre>element | param1 | param2</pre><br />
+    <pre>"element | param1 | param2"</pre><br />
 
     The following elements are available: