HELPP ME MY CODES NOT WORKING PLEASE HELP PLEASE WHOEVERS READING THIS HELP!! YEAH!!! IM TAKING TO YOU!! HELLPP

okay so im tryna add a banner and like showflakes falling from the top of the screen and a new cursor to my code but idk where to add them 

and i really need help.

please.

thankie.

-bootycall xoxo 

this is fr pls help if anyone actually knows css and how to code pls help im just winging it and now its bit my ass