Reindeer IE9 <hr> issue


There is an issue with

in IE9. Seems like
element has bugged height, because of IE8 styles are not applying to it. In other browsers(Chrome, Mozilla, Opera, IE8, IE7)
looks good. I meet this bug in my project and it can be also found on the vaadin samples page with IE9, at Reindeer theme section (welcome page).
How can i fix it in my project now?