Main.kt

@Composable
fun Main() {
    MyVerticalBox(
        name = "box1",
        modifier = Modifier.background(Color.Yellow)
    ) {
        MyVerticalBox(
            name = ">box2",
            modifier = Modifier
                .size(100.dp)
                .background(Color.Red)
        )
        MyVerticalBox(name = ">box3") {
            MyVerticalBox(
                name = ">>box4",
                modifier = Modifier
                    .size(50.dp)
                    .background(Color.Green)
            )
        }
    }
}