border last menu element

Hi there,

1. Add this CSS to your site:

.main-navigation:not(.slideout-navigation) .main-nav li.nav-button a {
	color: rgba(72,45,112,1.0);
	border: 3px;
	border-style: solid;
	line-height: 36px;
	border-radius: 2px;
	margin-left: 20px;
	transition: all 0.6s ease 0s;
}

.main-navigation:not(.slideout-navigation) .main-nav li.nav-button a:hover {
	color: rgba(72,45,112,0.8);
}

2. edit your menu, select the menu item you want the border on and give it a CSS Class of: nav-button
This doc explains how to add classes to menu items:

https://docs.generatepress.com/article/using-the-wordpress-menu-builder/#custom-classes

David! Thank you very much!

You're welcome