Closest hex to #45ff04 is #4f0

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#4f0

45ff04

45ff04

contains 4f

04f 14f 24f 34f 44f 4f0 4f1 4f2 4f3 4f4 4f5 4f6 4f7 4f8 4f9 4fa 4fb 4fc 4fd 4fe 4ff 54f 64f 74f 84f 94f a4f b4f c4f d4f e4f f4f

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 40

040 140 240 340 400 401 402 403 404 405 406 407 408 409 40a 40b 40c 40d 40e 40f 440 540 640 740 840 940 a40 b40 c40 d40 e40 f40