Fix header during scroll
<p>I am working on <a href="http://birsmatt.ch/gewerbe/" rel="nofollow noreferrer">this website</a>, and as you can see I have a different header for different pages. In the other pages the header, the navigation, and the logo are fixed on top during scroll but not in <a href="http://birsmatt.ch/gewerbe/" rel="nofollow noreferrer">this page</a>.</p>

<p>Is possible to fix them in this page as well via JS?</p>