The color definition should look like: "rrggbb",where:

rr - 2 hexadecimal digits, the weight of the red component, from 00 (0) to ff (255);
gg - 2 hexadecimal digits, the weight of the green component, the same range;
bb - 2 hexadecimal digits, the weight of the blue component, the same range;

Note:

hexadecimal digits: 0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f ;
never miss the quotation marks;
"ff" = "0000ff" , "0" = "000000" , etc;

Examples:

`"ff0000"`
`"00ff00"`
`"0000ff"`
`"ffff00"`
`"ff00ff"`
`"00ffff"`
`"ffffff"`
`"e0e0e0"`
`"c0c0c0"`
`"808080"`

`"ff80ff"`
`"ff0080"`
`"ff80c0"`
`"0080ff"`
`"8080ff"`
`"80ffff"`
`"80ff80"`
`"ffff80"`
`"c0c000"`
`"c0c080"`

`"000000"`
`"c00080"`
`"c000c0"`
`"00c000"`
`"008000"`
`"0000c0"`
`"000080"`
`"ff8000"`
`"c00000"`
`"800000"`