Hello!
How can I change the size of the nav bar?
I want to make it a little wider, to fit the logo exactly the right size.

Thanks!

It should be enough if You upload a wider logo image.
At the CSS the "title / logo" is set to a max of 52% so it should give you plenty of room to extend the width of the logo image.

I want a little and height...

Open the following file with a code editor like Notepad or Sublime:

sites/default/themes/the theme folder you use/less/colors.less

now scroll to the very bottom and include this:

``
.CODOFORUM .navbar {
min-height: 40px;
max-height: 60px;
}

You can change the height to fit your needs. Then save the file upload it again and recache your browser.