Bottom overflow by 30px

There are two solutions to this problem.

1. Add resizeToAvoidBottomPadding: false to your Scaffold

   Scaffold(
    resizeToAvoidBottomPadding: false,
    body: ...)
   

2. Put your FilstList(searchtext: _text,) inside a scrollableView (like SingleChildScrollView or ListView)

Use Scaffold property "resizeToAvoidBottomPadding: false" and "SingleChildScrollView" as parent of Scaffold body:

      home: Scaffold(
          resizeToAvoidBottomPadding: false,
          appBar: AppBar(
            title: Text("Registration Page"),
          ),
          body: SingleChildScrollView(
            child: RegisterUser(),
          )),

this will solve issue.

You should use resizeToAvoidBottomInset

Scaffold(
  resizeToAvoidBottomInset: false, // set it to false
  ... 
)

---

If you're having issues with overflow error, use SingleChildScrollView with it.

Scaffold(
  resizeToAvoidBottomInset: false, // set it to false
  body: SingleChildScrollView(child: YourBody()),
)