Header logo dimension

Hi! Sorry, there’s a way to modify the dimension of the header logo? I tried in different ways but i couldn’t. I’m not expert with php. The problem is that i’d like that the logo would be of the dimensions i say, at least bigger than the ads in the ad widget of the header.
Thank you in advance

you don’t need to edit php files. you only need to add this css code using custom css plugin:

img.site-logo {
  height: 170px;

Hi Awan, tank you so much!

I did it but nothing changed :-\