librenms-librenms/html/includes/print-device-graph.php

<?php

if (empty($graph_array['type'])) {
    $graph_array['type'] = $graph_type;
}

if (empty($graph_array['device'])) {
    $graph_array['device'] = $device['device_id'];
}

// FIXME not css alternating yet
if (!is_integer($g_i / 2)) {
    $row_colour = $list_colour_a;
}
else {
    $row_colour = $list_colour_b;
}

echo '<div style="background-color: '.$row_colour.';">';
echo '<div style="padding:4px 0px 0px 8px;" class=graphhead>'.$graph_title.'</div>';

require 'includes/print-graphrow.inc.php';

echo '</div>';

$g_i++;