As nice scroll is a jquery plugin for WordPress site. This plugin will create a nice scrollbar for your site.

anuislam

As nice scroll is a jquery plugin for WordPress site. This plugin will create a nice scrollbar for your site. 
After installing and Activating the plugin, go to WordPress Admin Dahsbord and then go to 
Appearance > As option 
Here you can customize default settings. So customize settings as you choice and see a nice scrollbar at you site front-end. 
you can see hear : https://github.com/anuislam/As-nice-scroll 
you can see live demo hear : http://as-nicescroll.tk/
All credit goes to nicescroll

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