Zubrick passes the W3C CSS and XHTML 1.0 Strict validations at http://d-theme.com/zubrick but fails to validate in Total Validator against the XHTML 1.0 Strict schema. There is one HTML error caused by the lack of a default style sheet language specification and activated by the use of inline styles in the following line. The best solution is to replace the style with a class.
<div style="float:left;">