css styling

hello, is it possible to style this menu – more than your parameters?

For example i would like to style it with round corners, like:

-webkit-border-radius: 10px;
-moz-border-radius: 10px;
border-radius: 10px;

but i can’t find any css file in your plugin folder.

Thank you for helping

https://wordpress.org/plugins/folder-menu-vertical/