Captive portal 404 when modify default template

[jimcease]

First let me say I am hot a html coder by any means, but I have been working with chat GPT for a bit on developing seasonal and holiday based pages for home guest network.  I actually with the help of chat gpt developed a calendar to display a theme or holiday based login page.  Went back and forth making modifications, but came down to making simple changes in the index and style file, but always seems to get a 404 once you click login.  I am unsure if it is some sort of redirection or coding being missed.  Any insight?