vnstat2-php-frontend/themes/light/theme.php

<?php
    $colorscheme = array(
         'image_background'   => array( 255, 255, 255,   0 ),
	 'graph_background'   => array( 220, 220, 230,   0 ),
	 'graph_background_2' => array( 205, 205, 220,   0 ),
	 'grid_stipple_1'     => array( 140, 140, 140,   0 ),
         'grid_stipple_2'     => array( 200, 200, 200,   0 ),
	 'border'             => array(   0,   0,   0,   0 ),
	 'text'               => array(   0,   0,   0,   0 ),
	 'rx'                 => array( 190, 190,  20,  50 ),
	 'rx_border'	      => array(  40,  80,  40,  90 ),
	 'tx'	              => array( 130, 160, 100,  50 ),
	 'tx_border'          => array(  80,  40,  40,  90 )
     );
?>