Remove space between section of gallery slideshow and section section

I am trying to remove this very small amount of background showing between my sections on my site which is empathized when scaled smaller. (see attached screen shot)

I am trying to find a way to remove this gap. 

CSS to make the image full bleed height?

OR

second option just to remove the gap at the bottom so the two sections can fit directly against one another?

Just for understanding I have code to move the header navigation below the 2nd section and have the gallery in the header section

URL- https://www.barestudio.co.uk/

password - testsite

7 hours ago, BareCreative said:

I am trying to remove this very small amount of background showing between my sections on my site which is empathized when scaled smaller. (see attached screen shot)

I am trying to find a way to remove this gap. 

CSS to make the image full bleed height?

OR

second option just to remove the gap at the bottom so the two sections can fit directly against one another?

Just for understanding I have code to move the header navigation below the 2nd section and have the gallery in the header section

 

URL- https://www.barestudio.co.uk/

password - testsite

I check that it is fine. It looks you have figured it out, right?

@Beyondspace Thanks for having a quick look, but sort of but not really, have managed a small work around but very messy and causes issues on smaller screens 

the code i placed in was - 

section[data-section-id="6373c8abf1b4e0080c28a194"]{
  margin-bottom: -0.25%;
}

but I would like something which meant it would scale and keep the image tight against the following section