how can I add a Colour Scrollbar

[cerberus22]

Hi all,

how can I add this code for coloured scroll bars to prestashop ? (everything I try does not work)

<style type='text/css'>
BODY
{
scrollbar-arrow-color : #FF0000;
scrollbar-face-color : #3F3F3F;
}
</style>

any ideas ??

all the best,
cerberus22