Header Image BIgger

I am trying to make the header image bigger. I enter the code below from another forum.

.site-branding {
padding-top: 5em;
padding-bottom: 5em;
}

This gave me padding but when I changed the image, the height is too short.

What am I doing wrong?

• This topic was modified 3 years, 2 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Developing with WordPress topic

The page I need help with: [log in to see the link]