You don't need to edit the theme's base css, or try to do anything in the core. What method did you use to remove the header?  Anything you do to the core, or base css will be lost on the next update.

It is usually as simple as adding this to the custom css for the theme in the admin panel.

.ow_header {
    display: none;
}

Timmy just to help you to understand the overall concept of how things work between the serverside and the clientside, you might want to take a look here. 

If you scroll down just a bit it will guide you thru the difference. :)

http://programmers.stackexchange.com/...ent-side-programming

php is serverside css,html,js,smarty  for example are clientside

+1 Darryl and dave

Hello
I have edited base.css and change the header height as 0px,
it works in iPad / Desktop version.
But there is still a blank in iPhone version.
Thanks :)

iPad Ver

iPhone ver

Try the css I listed above. Place it in the theme's custom css box in admin / appearance / customize click on the css tab. You will see the custom css box below the view of the base css.
The advantage of adding your css changes here is that they won' be overwritten the next time the theme is updated. It will only apply to the theme you are modifying, and will create a css file in the userfiles folder in the Oxwall directory.

Interesting site timmy, never seen a Oxwall community about toys before, interesting

Topic was moved from General Questions.