title: Change css class body in runtime JavaFX
body: <p>User settings often present in my application. The settings values can not be predetermined. For example a certain font size. For each size, I will not create css file and will not write inline-style css for font size. Suppose there is a set of Node, each marked with the class of css. Is it possible to change the css body for this css class? How to solve this problem for non-predetermined sets of settings values? </p>
  
  <p>It comes to mind only the solution such generating css file in the user directory</p>