1) Download the .js and .css files and upload them to your Squarespace website:
SectionLoaderSupreme.css
SectionLoaderSupreme.js
2) Copy the two code snippets, and paste them into their designated areas.
The styles go in the Site HEADER Code Injection area.
<!-- Section Loader from Will-Myers.com -->
<link rel="stylesheet" href="REPLACE_ME.css">
The javascript goes in the Site FOOTER Code Injection area.
<!-- Section Loader from Will-Myers.com -->
<script src="REPLACE_ME.JS"></script>
3) Replace the URL’s "REPLACE_ME.CSS" and "REPLACE_ME.JS" with the unique URL’s that Squarespace generates for the files you just uploaded.