Hi!
1. Coloring select items might not be supported within all browsers, but you could try the following:
To color parent items:
[html]select .asp_option_cat_level-1 {
color: red !important;
}[/html]
To color child (sub) items:
[html]select .asp_option_cat_level-1 {
color: blue !important;
}[/html]
2. Unfortunately as far as I know this is impossible, as it is browser specific, please see: https://stackoverflow.com/questions/570642/height-of-an-html-select-box-dropdown/570651#570651
I don’t think there is a workaround 🙁