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.

Salman Ahmed

Nice and Awesome Scrollbar for Web Site.
Plugin Features 
Easy to install 
Fully integrated in WordPress 
Simple installation & activation 
Unlimited colors. 
CSS3 animation. 
Supported touch devices. 
All browser supported 
Custom Width. 
Scrollbar border radius. 
Scrollbar scroll speed. 
Scrollbar border. 
Auto Hide Enable/Disable Mode. 
Lightweight Responsive. 
Easy Option Panel
Demo Link of this plugin: <a href="http://www.modinatheme.com/plugins/" rel="nofollow ugc">Live Demo</a>
<h3> Top Featured </h3>
<ol>
<li>Color Change Option</li>
<li>Plugin Option Panel</li>
<li>Light Weight Plugin</li>
<li>Modern UI Colors</li>
</ol>

Scrollbar vs ScrollKit – Nice Scrollbar