Increase width of column series in charts using CSS

Dears,

My requirement being increasing the width of each columns in a Column - Combination chart and i am unable to do that.

But i am able to fill colors to the columns with the following piece of code in CSS.

g.v-m-maing.v-m-plotg.v-column:nth-child(1) .v-datapoint.v-morphable-datapoint {fill: RGB(146,208,80)}

but when I try to increase width with the below piece of code its not working....

g.v-m-main g.v-m-plot g.v-column:nth-child(1) .v-datapoint.v-morphable-datapoint {width: 45px;}

Please let me know if I am missing anything in my code.

Rgds,

Sethu.