This preloaded developed by NixLab.org, you can freely download and use it.

Preloaders - are what you see on the screen while the rest of the page’s content is still loading. Preloaders are often simple or complex animations that are used to keep visitors entertained while server operations finish processing.

Download

Demo: just F5 this page.

Installation (Joomla):

1. Download preloader-nx.zip file and unzip it. You will find two files - preloader-nx.yaml, preloader-nx.html.twig) and one folder preloader-nx.
2. Copy preloader-nx.yaml and preloader-nx.html.twig to root/templates/TEMPLATE_DIR/custom/particles (if the particles folder does not exist, you will need to create it manually).
3. Copy preloader-nx directory to root/templates/TEMPLATE_DIR/custom.
4. Enable as standart Gantry 5 Atom.