title: Twitter Bootstrap. Remove whitespace between <div span> elements in columns
body: <p>I am trying to create framework for vacancies listing in pinterest-like way (infinite 5-columns wall with vacancies description) in Twitter Bootstrap using ruby-on-rails.</p>
  
  <p>But I have a problem - there are whitespaces between row's elements , like here:
  <a href="http://i.imgur.com/m9Z5U.png" rel="nofollow">http://i.imgur.com/m9Z5U.png</a></p>
  
  <p>I need to delete these whitespaces to show continuous canvas.</p>
  
  <p>Code I use to generate wall:</p>
  
  <pre><code>&lt;div class="row"&gt;
    &lt;% @employer_vacancies.reverse.each do |employer_vacancy| %&gt;
      &lt;div class="span2 hero-unit left"&gt;
        &lt;h2 style="margin-bottom:0px !important";&gt; 
          &lt;%= employer_vacancy.vacancy_title %&gt;  
        &lt;/h2&gt;     
        &lt;br&gt;
        &lt;%= employer_vacancy.vacancy_description %&gt;
       &lt;/div&gt;
    &lt;% end %&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I believe it could be achieved by JavaScript, or maybe even by CSS.</p>