Figured it out
my$bg_grey=$workbook->add_format();
$bg_grey->set_align( 'center' );
$bg_grey->set_bg_color('#E4E8E2');
$bg_grey->set_border('1');
my$bg_grey_url=$workbook->add_format(color=>'blue',
underline => 1,
);
$bg_grey_url->set_align( 'center' );
$bg_grey_url->set_bg_color('#E4E8E2');
$bg_grey_url->set_border('1');