Set the legend.position option to "none" to remove the legend (which is 
what the blue box [the default color of that data series] is part of).

On Tuesday, May 6, 2014 9:07:26 PM UTC-4, Mai Mostafa wrote:
>
> I used role:'style' to change the colors of combo chart's bars but I want 
> to remove the small blue rectangle 
> i tried to use annotations.boxStyle but nothig happened 
>
> also the font-size of numbers of Vaxis is not the same 
>
> var data = google.visualization.arrayToDataTable([
>          
>           ['Status', 'Number Of Students', { role:'style' }],
>           ['Pass', 10,style='fill-color: #109618'],
>           ['Pending', 14,style ='fill-color: #ff9900'],
>           ['Fail', 16,style ='fill-color:#dc3912;'],
>          
>         ]);
>
>

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