Update README.md

Author: okendoken

README.md

@@ -39,9 +39,9 @@ We have to alter it a bit:
 That's it. It will work. But it **will not** work if you nest input inside label or put label before input.
 
 If you want to enable **Opera 12** and earlier support  just add class `styled` to `input` element:
-````
+````html
 ...
-<input type="checkbox" id="checkbox1" style="styled">
+<input type="checkbox" id="checkbox1" class="styled">
 ...
 ````