Can I add a border to the main front page carousel?

I would like to add a white 4px border to the main carousel and the thumbnails underneath, is that possible? thanks

www.atalllongleggedbird.com

 

Hello,

Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

#slider ul.slides li img {
width: 900px;
border: 4px solid white;
}
#carousel ul.slides li img {
border: 4px solid white;
}