How to get rid of gap above nagivation bar?

Hello, i posted this topic already before but i didnt explain it quite well. So im building basic portfolio site that i will be upgrading on coming days. So im wondering how do i get rid of gap above my navigation bar?

Try adjusting the margins of h1 and ul.

h1 {
  margin-bottom: 0;
ul {
  margin-top: 0;