Using the emenu Yii extension for a menu. The underlying project for this extension is http://lwis.net/free-css-drop-down-menu/ .
Right now the sub menus display in a row (which does eventually wrap to a 2nd row). I’m using the “nvidia” theme.

How do I make submenus vertical? I want the items in the sub menu to stack vertically on top of one another.
This is a css issue. The inner
<ul>should have the style:width : 100%which comes from dropdown.css, but it is being overridden by themes/nvidia.com/default.css where it is specified as:width: 170px. So you can change that value back to100%by adding it in your own custom css file.dropdown.css:
themes/nvidia.com/default.css:
mystyle.css: