Hi there evo,
form elements in general and the select element in particular,
do not take kindly to attempts of customisation.
"In the early days of the Web—around 1995—form controls were added
to HTML in the HTML 2 specification.
Due to the complexity of form widgets, implementors chose to rely on
the underlying operating system to manage and render them."
Source:-
Why is it so hard to style form widgets with CSS?
My suggestion, for what it's worth, would be leave the select element as it is.
The only person who might be upset by this decision would be yourself.

coothead