Wordpress 3.0 drifting sidebar problem

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I'm using WP 3.0 with the latest Safari version. In my Kubrick template, the vertical sidebar drifts or leans rightward down the post blog page as I post new menu titles. I'm wondering if the following fix will work, or if someone can reply here with a clear css fix that does:



Step 1.

<div id="sidebar_back"class="fix">
<li>
<h2class="sidebarmenu">Blogroll</h2>



Step 2. Adding this to my style.css end file:

.fix }
clear:both;
float:none;

Thanks in advance!