title: find_element_by_class_name class spaces does not work
body: <p>I'm trying to use <code>find_element_by_class_name</code> where the class has spaces and it does not work:</p>
  
  <p>Here is the code:</p>
  
  <pre><code>&lt;a class="yt-simple-endpoint style-scope yt-formatted-string" href="/user/santanderbrasil"&gt;Santander Brasil&lt;/a&gt;
  </code></pre>
  
  <p>I want the get the content "Santander Brasil"</p>
  
  <p>I tried the following:</p>
  
  <pre><code>driver.find_element_by_class_name("yt-simple-endpoint.style-scope.yt-formatted-string")    
  driver.find_element_by_class_name("a.yt-simple-endpoint.style-scope.yt-formatted-string")
  </code></pre>
  
  <p>and</p>
  
  <pre><code>driver.find_element_by_class_name("a.yt-simple-endpoint.")
  </code></pre>
  
  <p>none of the worked...</p>
  
  <p>Any help?</p>