title: Different navbar styles in mobile sizes & desktop
body: <p>i'm trying to achieve a similar type of navigation styling for my own website that I saw on a template on WordPress called Enliven (see here - <a href="http://themezhut.com/demo/enliven/" rel="nofollow noreferrer">http://themezhut.com/demo/enliven/</a>). The template seems to have 2 different navs... in mobile it isn't fixed at the top and expands when clicked on.. when 992px or wider, the nav expands across the top and is fixed when you scroll. </p>
  
  <p>Can anybody help me out with achieving a navigation like this? possibly point me in the correct direction? I'm trying to become more familiar with Bootstrap 3 but have mainly taken courses on Bootstrap 4..</p>
  
  <p>Thank you! :)</p>