Custom CSS for dropdown menu

I was just wondering if you knew of an easy way to customize the font for the dropdown menu?

Using this in the style.css page customizes the text for the “list” option but not the “dropdown” option:
.widget-area .widget a { color: #353535; font-size: 18px; text-transform:capitalize; text-align:left; font-weight:bold; }
.widget-area .widget a:hover { color:#28739b }
.widget-area .widget li { text-align: left; }

This could be simple, I am not well acquainted with CSS.

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