Remove white space between content and header in posts

Hi,
I’ve been using the Minimatica theme for two weeks.
I really like it. This forum already helped me a lot with some issues.
But there are a few things i can’t figure out,
so here is my first question on this forum.

I’ve created some posts for my site.
Because i didn’t like the title bar, i’ve removed it.
This gave me more space for the site content.
I would like to use this space, but the content wil not move up.
There is a white space between the header of the post and the content.
I need to get rid of this white space, which is about 60p in height (i guess).
Does anybody know how i can do this?
Thanks in advance!
Will