How to modify the height and width of the button in ActionCell

[tong123123]

In ActionCell, a button is automatically generated and I want to change the button height and width, but I found that there is no addStyleName, setCellStyle or etc to write css to modify the generated button height and width, any method to do it?

[tong123123]

using Column.setCellStyleNames("xxx");
I can modify the button size by

.xxx button{
  height: 10px;
  width: 20px;
}

but I still cannot modify the size of the font in the button, any method to change the font size of the button?
I try

.xxx{
  font-size:10px;
}

or

.xxx button{
  height: 10px;
  width: 20px;
  font-size: 10px;
}

but all has no effect!!