Stack 
A representation of Z-axis layout.
NikuStack accepts all the props as same as Stack.
dart
// Using namespace
n.Stack([]);
// Using Niku Prefix
NikuStack([]);Example Usage 
dart
n.Stack([
    "Welcome".n,
    n.Button("Enter".n),
])
    ..topStart
    ..loose;Aligning items at the center 
dart
n.Stack([
    "This should be".n,
    "at the center".n
])
    ..center
    ..wFull
    ..hFull;