How do I move the drop down menu headings on the side panel of the mobile site higher up?

Site URL: https://www.sumofeight.com/

We are trying to move the drop down menu headings on the side panel of the mobile site higher up. Right now they are in the middle of the page. Does anyone know some coding to do this? 

Add to Design > Custom CSS

.header-menu-nav-folder-content {
    justify-content: flex-start;
}