How adjust number of display value in picker?

Questions
1

How to change radius of picker to decrease spacing of picker or how to change height of picker?

default it will display 7 line but i need to display only 5

Thanks

2

Just adjust height of .picker-item, e.g. add in CSS:

.picker-item {
  height: 100px;
  line-height: 100px;
}
3

Not need to decrese item heights, we need decrease all picker radius so its automatically decrese numbet of iterater at a time.

Is any way?