title: Fieldset height 100% of its parent
body: <p>I have 2 <code>fieldsets</code> wrapped in a <code>&lt;div&gt;</code>, let's call them <code>blah1</code> and <code>blah2</code>. </p>
  
  <p><code>blah2</code> can grow as the max of its <code>&lt;div&gt;</code> parent, but I need <code>blah1</code> to have the same % height of his sibling <code>blah2</code></p>
  
  <p><a href="http://jsfiddle.net/luissanchezm86/nGCdx/7/" rel="noreferrer">This is my demo</a></p>