title: horizontal navigation slide out with grow effect
body: <p>I want to recreate an effect I saw on airforce.com . It's right below the hero, I poked around a bit and can't seen to find out what they did. 
  It looks like it was developed using knockout but I would like to recreate it using jQuery and Css. </p>
  
  <p>If you know what the effect is called or know of a library that can achieve this, PLEASE let me know thanks!</p>
  
  <p><a href="https://www.airforce.com/" rel="nofollow">https://www.airforce.com/</a></p>