Closest hex to #99ff00 is #9f0

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#
#9f0

99ff00

99ff00

contains 9f

09f 19f 29f 39f 49f 59f 69f 79f 89f 99f 9f0 9f1 9f2 9f3 9f4 9f5 9f6 9f7 9f8 9f9 9fa 9fb 9fc 9fd 9fe 9ff a9f b9f c9f d9f e9f f9f

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 90

090 190 290 390 490 590 690 790 890 900 901 902 903 904 905 906 907 908 909 90a 90b 90c 90d 90e 90f 990 a90 b90 c90 d90 e90 f90