Themepoints

Scrollbar wp is fully customizable WordPress scrollbar plugin. You can change scrollbar color, border radius, scroll speed, width, border style & other settings using plugin option page.
<h3>Scrollbar by https://themepoints.com</h3>
<ul>
<li><a href="https://themepoints.com" rel="nofollow ugc">Live demo!»</a></li>
</ul>
Plugin Features 
<ul>
<li>Simple installation & activation</li>
<li>Unlimited colors.</li>
<li>CSS3 animation.</li>
<li>Supported touch devices.</li>
<li>All browser supported</li>
<li>Custom Width.</li>
<li>Scrollbar border radius.</li>
<li>Scrollbar scroll speed.</li>
<li>Scrollbar border.</li>
<li>Auto Hide Mode Enable/Disable.</li>
<li>Lightweight.</li>
<li>Easy Option Panel.</li>
<li>Easy Documentation.</li>
</ul>

Scrollbar

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

Rakib

This plugin will be change side bar of your website.
Demo Link: http://virtualproducts.org/scrollbar/

VP Scrollbar

This plugin will be change side bar of your website.

Scrollbar vs VP Scrollbar