entry dividers, can you change the color Options

[helpmeout]

you know the simple line dividers that appear to separate one entry from another? is there a code that changes the line to whatever color you want? please let me know, thanks

[C.Lime.Jello.]

CODE

<!-- begin code provided by createblog.com -->

<style type="text/css">
hr {
/* horizontal divider */
 border: 1px solid #B9F2B8;
 }
</style>

<!-- end code provided by createblog.com -->

Pretty self-explanitory.
Change the variables and stuff.
Goes into custom header...

[helpmeout]

hmm, I put the code in just like that, except I changed the color code....but it didnt change the divider colors...any idea what the problem might be?