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The new CSS Grid Layout Module I mentioned yearlier is extremely powerful and will obsolete Flexbox.  However, no browsers support it yet.  I went through a tutorial tonight but had to download Chrome Canary to get the examples to work.  If you page through this tutorial, you’ll get an idea of the concise syntax for very complicated layouts.

<https://webdesign.tutsplus.com/tutorials/css-grid-layout-quick-start-guide--cms-27238>

Nesting, gutters, packing varying shapes together is all covered

For TornadoFX, it might be worthwhile to borrow from this and skip over Flexbox.