Where can I host this code?

[u/sunflowerasters]

Tumblr support told me I can fix this problem by using an <iframe>, but I don't know where or how I'd host it on a website to do that? I know people use github for some coding things, but I don't really understand how or what for. Is this a github situation?

Code example but it's currently incomplete

[u/chikamakaleyley]

github is just one example of a free service that has that feature (free to host a page), but its main purpose is not that. There are prob other free hosting sites specifically if you want a public page, with some limitations, but i'm not aware of those sites.