Closest hex to #ceff21 is #cf2

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#cf2

ceff21

ceff21

contains cf

0cf 1cf 2cf 3cf 4cf 5cf 6cf 7cf 8cf 9cf acf bcf ccf cf0 cf1 cf2 cf3 cf4 cf5 cf6 cf7 cf8 cf9 cfa cfb cfc cfd cfe cff dcf ecf fcf

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

contains c2

0c2 1c2 2c2 3c2 4c2 5c2 6c2 7c2 8c2 9c2 ac2 bc2 c20 c21 c22 c23 c24 c25 c26 c27 c28 c29 c2a c2b c2c c2d c2e c2f cc2 dc2 ec2 fc2