squares on index page and size of logo not resolved

hello,
on the index page, how to go up the three squares “Search” “Rome” and “Côte d’Azur” for they appear a little higher on the slider ?

Furthermore, our site’s logo is too small and we fail to do bigger?
We would like it to appear bigger. When we try to change the size of the logo, it shifts everything else.
Thank you in advance.

Gaspar