Answer 1

cricket king sujit gautam
Your code link is inaccessible if you put it in the question title. Links do not work when placed in title or tag, you need to place links in Description.

Answer 2

are you talking about this code:

https://code.sololearn.com/W0g8fOJ89YKC/?ref=app

most recent of your public codes... but public id doesn't match partial public id provided ^^

anyway, to add dark/light mode to a page, you just have to put a root element with a specific class name, and (that's the big work) prefix all rules to be overrided by mode (ie: if default mode is light, add a dark class to a root element, and style your page according to that)