Closest hex to #21fb7b is #2f7

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#2f7

21fb7b

21fb7b

contains 2f

02f 12f 22f 2f0 2f1 2f2 2f3 2f4 2f5 2f6 2f7 2f8 2f9 2fa 2fb 2fc 2fd 2fe 2ff 32f 42f 52f 62f 72f 82f 92f a2f b2f c2f d2f e2f f2f

contains f7

0f7 1f7 2f7 3f7 4f7 5f7 6f7 7f7 8f7 9f7 af7 bf7 cf7 df7 ef7 f70 f71 f72 f73 f74 f75 f76 f77 f78 f79 f7a f7b f7c f7d f7e f7f ff7

contains 27

027 127 227 270 271 272 273 274 275 276 277 278 279 27a 27b 27c 27d 27e 27f 327 427 527 627 727 827 927 a27 b27 c27 d27 e27 f27