title: css gradient background button
body: <p>I would create a button like this (GetStarted button) in this page:
  <a href="http://www.behance.net/signup/" rel="noreferrer">http://www.behance.net/signup/</a></p>
  
  <p>I don't know how create the blue background gradient button. I don't understand what are the css property to use.</p>
  
  <p>Who can help me?</p>
  
  <p>Thanks a lot.</p>