DEMO

http://jokeronaldo.github.io/semantic-ui-fixed-sidebar-no-overlay/

Requisites

semantic-ui (obvious) with the following components:

• sidebar
• popup
• dropdown

Just clone or extract files at the root of your project

You may change directories relative to your semantic install at:

<script src="semantic/dist/semantic.min.js"></script>
<link rel="stylesheet" type="text/css" href="semantic/dist/semantic.min.css">