Need help in linking html from github gist to webflow

Hello, I want to implement a simple drop-down which is equivalent to a select input in html with about 300 options tags which exceed the 10k set for embedded element. After following an explanation i saw, I put it as a gist here

But then when trying to serve with rawgist by changing the url to i get 403 forbidden error so i guess it because rawgist is closing up. Then I tried with with and but I got 404 error. I had no idea why this is so or what I am doing wrong. Also I have no idea on the best way to use this link if it later works. Either to set inner HTML of an element and inject it there with javascript, or how I can work this with embedded component. I will await your resolve. Thanks.

You could easily swap to like;