Twenty Twelve menu overlay issue

Hi,

Firstly would like to say this is just what I am looking for and looks great!

I have noticed something which I don’t think will be an issue, as any code I post will be further down the page, however I thought it would be helpful to bring it to your attention.

Basically I am using the Twenty Twelve theme, I have placed some sample code using Crayon on the page, which is located right at the top as a test post. When I hover over the main menu for my theme, the sub page menu opens and displays incorrectly as it covers some of the posted code using Crayon.

The effect can be seen here by hovering over the “Articles” menu tab
http://coder-tronics.com/arduino-adc/

Cheers,

Ant

http://wordpress.org/plugins/crayon-syntax-highlighter/