How to write CSS code for particular control

Question

I developed a JavaFx stand alone application, which is having following controls

Two sets of -- Button btn1,btn2; Two sets of -- LineChart lc1,lc2;

In .css file

Answer 1

You probably need an extra space between the id of the chart and the chart line class:

#lc1 .default-color0.chart-series-line { -fx-stroke: green; }
    ^-- here