Header Underline SimpleCorp

Hello,

I am using the theme Simple Corp to set up a blog here:

https://www.ypodweddingvideos.co.uk/blog

On the homepage there is a grey line under the header which is not there on any of the other pages.

I seem to be able to add the line to the other pages, but it shows up a little higher than I want and seems to be behind the logo image.

How to I add the line to the other pages so it looks exactly like the homepage?

Also, on the homepage there is a large space above the footer, I would like to reduce this if possible.

Thanks in advance for any help ??