changing hight

Is it possible to change the hights of sections in JA_stark?

Which section you want to change the height? and how you want it should be?

I want to change the hero section and section-1. I want them to be smaller

You can try with:

div#t4-hero {height: 800px;}
div#t4-section-1 {height: 500px;}

and change to your desired value.