Remove space between slider and header

Can you share link to your site?

Site is currently under maintenance, but I can send you a snapshot:
https://imageshack.com/a/img850/6056/l49m.jpg

Any suggestion?

Hello danicasati!

To remove this space, you’ll want to make modifications to your theme’s stylesheet. This isn’t something we can provide step-by-step support for, unfortunately.

I know it, but I’ve tried some hacks and no one is working.

U r going to have to override the themes CSS. I recommend using a child theme, and add the following code to your child-themes stylesheet:

.site-header-main {padding: 0 !important;}