The 'backgroundColor' option controls the background settings (border, 
border width, and fill); 'colors' controls the colors of the elements (array 
of colors, assigned by series [DataTable column]); 'vAxis.gridlineColor' 
controls the color of the horizontal gridlines (use 'hAxis' instead for 
charts with vertical gridlines).  There is no API support for adding 
vertical lines to Line Charts (or any other chart that normally has 
horizontal gridlines; vice versa for charts that normally have vertical 
gridlines).  To use the options, do something like this:

chart.draw(data, {
    width: 970,
    height: 540,
    title: 'Commodities',
    backgroundColor: {
        stroke: '#FF0000',
        strokeWidth: 5,
        fill: '#00FF00'
    },
    colors: [
        '#0000FF'
    ],
    vAxis: {
        gridlineColor: '#FFFF00'
    }
});

Note that my arbitrarily selected colors produce a horrible color scheme, 
please don't use them  >;o)

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