What is our review of a federal court's award for attorney's fees, expenses and costs for abuse of discretion?

"We review a district court's award for attorney's fees, expenses, and costs for abuse of discretion." Lilly v. City of New York, 934 F.3d 222, 227 (2d Cir. 2019). 42 U.S.C. 1988 authorizes "courts to award the prevailing party in civil rights actions 'a reasonable attorney's fee.'" Id. Courts calculate a presumptively reasonable fee under 1988 by "determining the

appropriate billable hours expended and setting a reasonable hourly rate, taking account of all case-specific variables." Id. at 229-30 (internal quotation marks omitted). "Given the district court's inherent institutional advantages in this area, our review of a district court's fee award is highly deferential." Id. at 227 (internal quotation marks omitted).