WordPress Header Text Random Hover Color

My heading for WordPress is using the blog name.

I think this is the code in WordPress that displays the header text:

 <a id="logo" href="<?php echo home_url(); ?>" <?php echo $logo_class; ?>>

I can change header text using the below CCS code:

header#top #logo {}

I want to change it so text to randomize on hover. Similar to this http://ift.tt/1GUHksh

Any ideas how?

Thanks in advance.