How to put the point in a numbered list after the number?

Guys, please tell me how to put a period after the number in a numbered list?
June 8th 19 at 17:13
3 answers
June 8th 19 at 17:15
content: counter(li, decimal) ".";
June 8th 19 at 17:17
Probably, it is necessary to remove the list styles and numbered list point by themselves and appear. OL>LI is numerology list.

Either :before or :after connecting to.
June 8th 19 at 17:19

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