Placing Text in Columns in CSS

column-count column-width columns column-rule column-span column-gap

Given a div with a width of 80%, make the text in this div line up in columns with a width of 300px.

Given a div with a width of 1000px, make the text in this div line up in four columns.

Modify the previous problem so that the distance between columns is 30px.

Modify the previous problem so that there is a dotted gray border between the columns.