Important: If you have an error or white screen after updating Elementor, please see here for the solution: http://bit.ly/2KRhmLQ

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Adding an accent or outline button in the main menu

From the WP Dash / Appearance / Menus / make sure the menu item you want to style has a class of 'th-accent'

If you don't see the CSS Classes option, go up to Screen Options tab at the top and check the 'css classes'

Cheers!