css help kinda

heres a docs file with some basics, well more like stuff i copid and pasted from mine but oh well. i also kind of explained the meaning or what the things do if that makes sense :)

https://docs.google.com/document/d/1_2cBdt49eYwoOWNCJopq8dF_a3KqUP4qDBDC47KtLRE/edit?usp=sharing