Closest hex to #F90021 is #f02

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#f02

F90021

F90021

contains f0

0f0 1f0 2f0 3f0 4f0 5f0 6f0 7f0 8f0 9f0 af0 bf0 cf0 df0 ef0 f00 f01 f02 f03 f04 f05 f06 f07 f08 f09 f0a f0b f0c f0d f0e f0f ff0

contains 02

002 020 021 022 023 024 025 026 027 028 029 02a 02b 02c 02d 02e 02f 102 202 302 402 502 602 702 802 902 a02 b02 c02 d02 e02 f02

contains f2

0f2 1f2 2f2 3f2 4f2 5f2 6f2 7f2 8f2 9f2 af2 bf2 cf2 df2 ef2 f20 f21 f22 f23 f24 f25 f26 f27 f28 f29 f2a f2b f2c f2d f2e f2f ff2