Stacked-chart: Change bar height does not work

Hello everbody,

I want to change the colour and the height of a bar (Chart type: Bar - 100% stacked).
When I use the following css code I can change the colour and the stroke-width. But setting the height of the bar does not work.
Any ideas, how I can change my css code to make this work, would be welcome.

.mycss svg > g.v-m-main > g.v-m-plot > g.v-datashapesgroup > g.v-stackedbar > g.v-axisGroup > g.v-datashape:first-child > rect.v-datapoint.v-morphable-datapoint
{
height: 50px; 
stroke-width: 10px; 
fill: white;
}

(I did get it to work with Chrome and a slightly different code, but not with IE or Firefox.)

Thanks a lot
Dominik