Forum Moderators: not2easy
As far as I know, you can't customize the border of a true select box form with CSS. But you can get a similar effect:
1) Create a custom menu
2) Enclose it in a div where you use CSS to declare the exact border you are looking for
3) Add an arrow-like button to show or hide the div (in the place of the drop down "arrow")
Here are some ideas that might help:
custom menu [geocities.com]
show/hide [geocities.com]