Closest hex to #FF003B is #f03

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#f03

FF003B

FF003B

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 03

003 030 031 032 033 034 035 036 037 038 039 03a 03b 03c 03d 03e 03f 103 203 303 403 503 603 703 803 903 a03 b03 c03 d03 e03 f03

contains f3

0f3 1f3 2f3 3f3 4f3 5f3 6f3 7f3 8f3 9f3 af3 bf3 cf3 df3 ef3 f30 f31 f32 f33 f34 f35 f36 f37 f38 f39 f3a f3b f3c f3d f3e f3f ff3