GP: Trigger specific Menu Item

Dem Menu Item die class
nav-button 
geben.

@media (min-width:769px) {
  .main-navigation .main-nav ul li.nav-button a {
    background-color: #ffffff;
    border: 2px solid #000000;
    color: #000000;
    line-height: 35px; /*this number will likely need to be adjusted*/
  }
}