title: Hide/Show <div> makes page larger
body: <p>I'm creating a job application form.</p>
  
  <p>When you click to show the div; the page gets bigger both vertically &amp; horizontaly. </p>
  
  <p>Could someone help me to understand why.</p>
  
  <p>Thank you</p>
  
  <p><em>Edit: Firefox I noticed the problem.</em></p>