Answer 1

Hello Fijo, please remember to use the search bar before posting a question. Most of the times, your question will have already been asked by someone else before:
https://www.sololearn.com/discuss/1505815/?ref=app
https://www.sololearn.com/discuss/178976/?ref=app
https://www.sololearn.com/discuss/1416445/?ref=app
https://www.sololearn.com/discuss/1387918/?ref=app

Or refer to our CSS tutorial instead:
https://www.sololearn.com/learn/CSS/1079/

Answer 2

thanQ. all
I refered the Q&A posted earlier.