Advanced Scrollbar lets you add a scrollbar with customizable color, width, background, and speed for a sleek, branded user experience.

Customize your browser scrollbars with unlimited styling and color using scrollbar wp plugin.

ScrollKit - Nice Scrollbar

[This plugin can change the color, width,height of scrollbar in the wordpress website.]

WP Color Scrollbar is a jQuery custom scrollbar for your wordpress website. This plugin will enable awesome custom scrollbar.