Elektron sticky header

...

Code

Supported browser : http://caniuse.com/#feat=css-sticky

HTML

  <!-- BEGIN .elk-header -->
  <header class="elk-header is-sticky">
    <a href="#elk-side" data-toggle="onoffcanvas" class="onoffcanvas-toggler" aria-expanded=false></a>
    <span>APP HEADER</span>
  </header>
  <!-- END:  .elk-header -->

lorem