UsingMondrianClassicalLayoutAPI.swift

let backgroundView = UIView.mock(backgroundColor: .neon(.violet))
let box1 = UIView.mock(backgroundColor: .neon(.red), preferredSize: .largeSquare)
let box2 = UIView.mock(backgroundColor: .neon(.yellow), preferredSize: .largeSquare)

view.addSubview(backgroundView)
view.addSubview(box1)
view.addSubview(box2)

mondrianBatchLayout {

  backgroundView.mondrian.layout.edges(.toSuperview)

  box1.mondrian.layout
    .top(.toSuperview, 10)
    .left(.toSuperview, 10)
    .bottom(.toSuperview, -10)

  box2.mondrian.layout
    .top(.toSuperview, 10)
    .left(.to(box1).right, 10)
    .right(.toSuperview, -10)
    .bottom(.toSuperview, -10)

}