visual studio vb debug css style from not rendering

<style>
 #ctrtable{width:600px;margin-left:auto;margin-right:auto;}
</style>

Web page has the above style block above to to center table on viewport

 

When in VisStudio 2013 express running in debug mode css does not render, table is aligned left. However, if I copy and paste the style to an inline style="", the table is rendered in center

???

tom