nikuOutlined method
Switch to Niku() property as OutlinedButton
After this method is called, NikuFlatButton property can't be applied anymore
NikuButton("Button")
.bg(Colors.blue)
.px(18)
.py(16)
.rounded(8)
.nikuOutlined()
.build() // Collect all style and render
Implementation
Niku nikuOutlined({Key? key}) => Niku(this.outlined(key: key));