title: protractor no element found using locator by cssselector?
body: <p>Getting my head around protractor... How can I access a button element on an angularjs page that looks like this:</p>
  
  <pre><code>&lt;button class="button primary"&gt;Save&lt;/button&gt;
  </code></pre>
  
  <p>Using this in my test:</p>
  
  <pre><code>element(by.css('button primary')).click();
  </code></pre>
  
  <p>Getting an error:</p>
  
  <pre><code>NoSuchElementError: No element found using locator: By.cssSelector("button primary")
  </code></pre>
  
  <p>How can I fix this?</p>