Divider({Key key, double height: 16.0, double indent: 0.0, Color color })

Creates a material design divider.

The height must be at least 1.0 logical pixels.

Source 

Divider({
  Key key,
  this.height: 16.0,
  this.indent: 0.0,
  this.color
}) : super(key: key) {
  assert(height >= 1.0);
}