You will need to install a user script manager extension to install this script.
This script should not be not be installed directly. It is a library for other scripts to include with the meta directive
// @require https://sleazyfork.org/scripts/437251-roblox-2021-style/code/Roblox%202021%20style.js?version=999819
if you installed 2008 style or 2010 style or 2012 style here come back to 2021 style:)