Disable Sticky Header?

I am screwing around on a site located here:
http://66.147.244.78/~themuff3/
It is the AllAround theme.
How is the sticky header enabled or disabled? Usually most themes I use have a checkbox in the theme options admin to enable or disable the sticky header but this one does not and it is active by default.

Is it in the css or js or maybe I could just remove something from the header.php file?

I could style the smaller header that appears when you scroll to match the default header which is larger but there is still a "flash" that blinks when you scroll.

Thanks for any advice

 

Here how to do :
open : header_style.css
Find :

.header_wrap {height:99px; width:100%; z-index:999; position:fixed; top:0; left:0;

Code (markup):

Then remove : position:fixed;

That's all !

Goodluck

 

Yes that worked thanks!!
Although I am leaving as is for now so I can ask another question.
What if I leave the header fixed at the top and let the content scroll as it does now, when you scroll, the header section flashes and blinks, it seems to be loading something different or displaying a "display:none" to one of the elements which would normally make the header smaller but changed the css so header remains full size.
How can I just remove the flash/blink that occurs when you first start scrolling? Keep the header the same size & fixed but eliminate the blink? Hope that makes sense, if you just start scrolling you will see the blink on the header.

thanks!