tienhmdev

The “TINET Chat Buttons” displayes an fixed contact button on the bottom right of the screen. It opens an modal with your favorite contact form plugin. Before you have to generate a contact form and after this copy the shortcode into the plugin settings form Floating Contact Button. 
The plugin is real lightweight. The .css file is minimized to load as fast as can.
<h3>A brief Markdown Example</h3>
<pre><code><?php code(); // goes in backticks ?>
</code></pre>

TINET Chat Buttons

Thanks!

TINET.VN Chat Buttons is a free WordPress plugin for adding the live chat/call functionality of popular social media messaging apps.

BonfireThemes

The “Simple Sticky Header on Scroll” plugin adds a slide-down sticky header to any WordPress theme. When scrolling down, the header appears and presents quick navigation opportunities for the user; this is a modern usability solution that’s more and more popular these days, and now you can add a sticky header to your site without having to switch or alter your current theme in any way.
Add your logo, color customize every detail to make sure it fits your theme’s color scheme, enable/disable different elements like the ‘next post’ button. When on smaller screens, the horizontal menu switches over to a dropdown menu, ensuring a comfortable browsing experience on all devices and screen sizes. You can also customize after how much scrolling the sticky header slides into view to fine-tune it to your site.
Features:
<ul>
<li>Quick and simple setup</li>
<li>Add your logo and menu</li>
<li>Set custom scroll distance for sticky header’s appearance</li>
<li>Color customize every element</li>
<li>Setup and customization can be done quickly and in real-time via the WordPress Live Customizer</li>
</ul>

Simple Sticky Header on Scroll

Add the modern functionality of a sticky header that appears on scroll to your theme.

TINET Chat Buttons vs Simple Sticky Header on Scroll