Extra space on top and on the sides of the slideshow

I applied the changes and works like a charm except when the screen width is bigger than 768px and the main menu has a lot of items (see attachments)
Works fine when the screen width is less than 768px and when the main menu and the left menu don't stack.

Moving this to "Fixed" for now, then. If anyone is having a particular issue with this task, please let me know and I'll re-open the task