Why is my css code is not working here?

Question

https://code.sololearn.com/Wh5U5Tz4yJ59/?ref=app

Answer 1

Put the CSS in the CSS tab

https://code.sololearn.com/W5oipY5HfByb/?ref=app

Answer 2

put your CSS in the CSS tab or in a style tag inside the head tag

Answer 3

thanks

Answer 4

no problem

Answer 5

you can't be type anything without title.
use other tags and try them