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    my %opts = (bg_color => $front_color,
        align => "center",
...

    #  Add and define a format
    my $format_2 = $workbook->add_format(%opts);

my $sRGB = $parser->ColorIdxToRGB($format->{Fill}->[2]);
my $sRGB_2 = $workbook->color_idx_to_rgb($format->{Fill}->[2]);

my $backgroundcolor = $workbook->set_custom_color($back_color,
                              $sRGB);

    my %opts = (bg_color => "ffff00",
        align => "center",
...

    #  Add and define a format
    my $format_2 = $workbook->add_format(%opts);

#!/usr/bin/perl
use strict;
...
RGB Yellow: ffff00
RGB Excel: FFFF00
RGB int: 34