Space bar between header and body content

Hello All
I want to resolve this problem by my self but i filed .
I have an issue with space bar appear in the top of the body between the header and body content.
1-
https://drive.google.com/open?id=1RZkPwQ6BI3tgH4mX1F1zusgy6cFLXHLx

when i but -73 in the separating space in Layout Container under Separate Containers the space space bar Disappear in Customizing but Disappear in browser as in the photo below:
2-
https://drive.google.com/open?id=1_XvpIFhd0Ihvlrqe3puvkWXAkAUtTMFe
but in reality appear like that:
3-
https://drive.google.com/open?id=1Qan9f3ZJu-NBoHpb-VHVEsUzV5Rhy86C

Under one container is like that

4-
https://drive.google.com/open?id=1GS33o2-YVDjiDDvQYC5T3ibrqLPjBYwg
5-
https://drive.google.com/open?id=1IE2F8162MJ3pw5EQr-VEqSf0_neXxZ9n

I Checked with tools and i found that the space come from margin-top 34px , and i don't know which file .css i will find to put it 0px
6-
https://drive.google.com/open?id=15YCHOwFi6x-2Suu3OdXpDT4yUAam-isE
7-
https://drive.google.com/open?id=12CR2jYbNoXa5tkIS1aZbfXCcPFOp84ny

i hope my question is clear