WP custom post create

I'm created WP post and I insert this code https://codepen.io/pbweb/pen/yvGGdE. After I can see change my theme color. How to fix?. How to create a custom post?

Not sure why this is in White Hat SEO, but you cannot just go ahead and copy paste all kinds of code into your Wordpress posts and expect it to work.

If you want something like that implemented on your wordpress site, either find a plugin or get a developer who will make that for you.