The decision for Brown v. Board of Education appears in Volume 347 of the United States Reports (abbreviated U.S.) on page 483, and it was decided in 1954. Note. The name is in italics in the "short form" of the citation, the in-text citation.
Name v. Name, Volume# U.S. Page# (Year). URL
The U.S. Supreme Court decisions are published in the United States Reports (abbreviated U.S.) but as it only contains Supreme Court decisions, the name can be inferred so omit the name of the reporter. Cite the Supreme Court Reporter for cases not yet published in the United States Reports.
Example with page numbers:
Burnwell v. Hobby Lobby Stores, 573 U.S. 682 (2014). https://www.oyez.org/cases/2013/13-354
Example no page numbers:
Masterpiece Cakeshop, Ltd. v. Colorado Civil Rights Commission, 584 U.S. ___ (2018). https://www.oyez.org/cases/2017/16-111