how to remove separator line between header and body

Hi Ajay,

Can you share the link to the site in question?

You may use the Private Information field for this: https://docs.generatepress.com/?s=private+information

please check is out

In Appearance > Customize > Additional CSS, you have this code:

.site-header {
	border-bottom: 1px solid #dddddd;
}

You can remove that to remove the border.

Thanks what if I want to increase and decrease the size between the header and content like up and down because the content is far more down, and the space is so much between the header and body

Can you try modifying either the separating or content space in Appearance > Customize > Layout > Container?

Try reducing the top padding there as well.