Help with User Story #10 on portfolio project

So I’m doing the portfolio project and I’m getting hung up on user story 10. I can past the story by adding height: 100vh to #welcome-section, but I’m notice a large chunk of unwanted white space under the section and I’m not sure what is causing it. Can anyone help me out? Thanks

It is the top-margin on the h1 inside the projects-header div.

#projects-header > h1 {
  margin-top: 0;
}