Closest hex to #d40d21 is #c12

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#c12

d40d21

d40d21

contains c1

0c1 1c1 2c1 3c1 4c1 5c1 6c1 7c1 8c1 9c1 ac1 bc1 c10 c11 c12 c13 c14 c15 c16 c17 c18 c19 c1a c1b c1c c1d c1e c1f cc1 dc1 ec1 fc1

contains 12

012 112 120 121 122 123 124 125 126 127 128 129 12a 12b 12c 12d 12e 12f 212 312 412 512 612 712 812 912 a12 b12 c12 d12 e12 f12

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