Create a static menu CSS

Is there a way to set a menu in a Wordpress DIVI site as static?

    #main-header {
position: fixed !important;
}

For instance:

http://ift.tt/1giIwHX

The menu stays on the top and as you scroll down, you no longer see it.

So it does not go as a sticky menu.

Please share your thoughts!

Cheers,

Just a regular dude