CSS List Item Underline

I have a menu generated by Wordpress.  I am using the CSS flex rule to split it into 2 columns.  However, the very first menu choice has a class added to it called "underline" which places a bottom border on that menu choice.  Since the menu splits into 2 columns, I am wondering if there is a way to have the underline class go all the way across the two column menu?  Meaning, the first menu choices spans the entire block and then all of the menu choices after rre in two columns?
Robert GranlundAsked:
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what about ovewritten the class rules with << !important >> ?

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