title: how can I customize form css?
body: <p>When using @helper.input.... in template, an example of default css is:</p>
  
  <pre><code>&lt;dl class="error" id="age_field"&gt;
      &lt;dt&gt;&lt;label for="age"&gt;Age:&lt;/label&gt;&lt;/dt&gt;
      &lt;dd&gt;&lt;input type="text" name="age" id="age" value=""&gt;&lt;/dd&gt;
      &lt;dd class="error"&gt;This field is required!&lt;/dd&gt;
      &lt;dd class="error"&gt;Another error&lt;/dd&gt;
      &lt;dd class="info"&gt;Required&lt;/dd&gt;
      &lt;dd class="info"&gt;Another constraint&lt;/dd&gt;
  &lt;/dl&gt;
  </code></pre>
  
  <p>How can I customize it?</p>
  
  <p>Thanks.</p>