you can put it in your custom header or your web stats:
CODE
<!-- begin code provided by createblog.com -->
<style type="text/css">
body {
scrollbar-arrow-color: #FFCDD2;
scrollbar-track-color: #FFCDD2;
scrollbar-shadow-color: #FFCDD2;
scrollbar-face-color: #FFCDD2;
scrollbar-highlight-color: #FFCDD2;
scrollbar-darkshadow-color: #FFCDD2;
scrollbar-3dlight-color: #FFCDD2;
}
</style>
<!-- end code provided by createblog.com -->