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The main app screen doesn't have this issue, all the texts show up as they should.

However, in the new screen, all the text widget have some weird yellow line / double-line underneath.

Any ideas on why this is happening?

The problem is having a Scaffold or not. Scaffold is a helper for Material apps ( AppBar , Drawer , that sort of stuff). But you're not forced to use Material .

What you're missing is an instance of DefaultTextStyle as a parent:

DefaultTextStyle(
  style: TextStyle(...),
  child: Text('Hello world'),
Various widgets add one to change the default text theme, such as Scaffold, Dialog, AppBar, ListTile, ...
It's DefaultTextStyle that allows your app-bar title to be bold by default for example.
                Also keep in mind for a Hero, it is disconnected from the parent while 'in flight' so adding a Material (or any Theme) as the Hero's child (BOTH sides) fixes it in the transition. See github.com/flutter/flutter/issues/30647
– aaronvargas
                Jul 9, 2019 at 16:36
                @Rémi If you said Theme instance is missing in the parent, Why having Theme on top instead of Material or Scaffold doesn't help solve the problem? I just try it.
– kitta
                Dec 31, 2020 at 8:52
                Adding a Theme parent does not solve the problem. DefaultTextStyle is the missing parent, as per documentation
– Andrei Tudor Diaconu
                Jul 21, 2021 at 11:17
                surrounding the text or widget with Material widget helped me. Adding Material as root element didn't help in my case
– MMK
                Jan 4, 2019 at 10:07
                Thanks for pointing out type: MaterialType.transparency,. Needed it because my child had rounded borders so I was seeing a white background.
– Juukie14
                Jul 7, 2021 at 8:33
All you need to do is provide a Material widget, or a Scaffold which internally covers this widget. You can do that in the following ways:
Use Material (simple and better):
Material(
  color: Colors.transparent, // <-- Add this, if needed
  child: Text('Hello'),
Set Text.style property:
Text(
  'Hello',
  style: TextStyle(decoration: TextDecoration.none), // Set this
Provide Scaffold:
Scaffold(body: Text('Hello'))
Fixing yellow text issues when using Hero :
As aaronvargas mentioned, you can wrap your child in Material when using Hero on both sides. For example:
Hero(
  tag: 'fooTag',
  child: Material( // <--- Provide Material
    type: MaterialType.transparency,
    child: YourWidget(),
Just adding another way I encounter to these answers. 
Wrap the root Widget around a DefaultTextStyle widget. Altering each Text widget is not a necessity here.
DefaultTextStyle(
    style: TextStyle(decoration: TextDecoration.none), 
    child : Your_RootWidget
Hope it helps someone.
problem: your widget doesn't have default text style,
solution: wrap it in one!
DefaultTextStyle(
    style: TextStyle(),
    child: yourWidget,
remember if you dont set any color, default text color is white!
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Center(
          child: Text(
            "21:34",
            style: TextStyle(fontSize: 50),
        Center(
          child: Text(
            "Wakey - wakey",
            style: TextStyle(fontSize: 20),
After (Solution):
Here Wrap the current top or parent widget with Scaffold widget
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Center(
            child: Text(
              "21:34",
              style: TextStyle(fontSize: 50),
          Center(
            child: Text(
              "Wakey - wakey",
              style: TextStyle(fontSize: 20),
Full code:Dartpad or Live code
import 'package:flutter/material.dart';
void main() => runApp(MaterialApp(home: sta()));
class sta extends StatefulWidget {
  const sta({Key? key}) : super(key: key);
  @override
  State<sta> createState() => _staState();
var isShow = false;
class _staState extends State<sta> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Center(
            child: Text(
              "21:34",
              style: TextStyle(fontSize: 50),
          Center(
            child: Text(
              "Wakey - wakey",
              style: TextStyle(fontSize: 20),
There is an other solution for this , especially if you are using multiple pages wrapped under main.dart file You can do something like this:
  child: MaterialApp(
    home: Material(child: Wrapper()),
This will remove the yellow lines under text that is present in any pages referenced/used under wrapper.
The yellow lines come from _errorTextStyle. The documentation states that you should define a DefaultTextStyle parent (or use Material, which does this for you):
MaterialApp uses this TextStyle as its DefaultTextStyle to encourage developers to be intentional about their DefaultTextStyle.
In Material Design, most Text widgets are contained in Material widgets, which sets a specific DefaultTextStyle. If you're seeing text that uses this text style, consider putting your text in a Material widget (or another widget that sets a DefaultTextStyle).
Developing Flutter apps without material is not something most people do, but if that's your use case, you should use DefaultTextStyle.
Contrary to the accepted answer, Theme does not set a DefaultTextStyle, so it does not solve your problem. Scaffold does solve the problem, as it contains Material, which in turn defines DefaultTextStyle, but Scaffold is a bit more than you need for a Dialog, Hero, etc.
To permanently solve this for your whole app, you could set the DefaultTextStyle in your MaterialApp builder. This solves the issue for all the components of your app, not just the current screen you're working on.
You can also have your scaffold as the home for your MaterialApp. This worked for me.
return MaterialApp(
  home: Scaffold(
    body: Container(
      child: SingleChildScrollView(child: Text('Test')),
I recommend this approach because you could do it once and it will override your whole app.
Add DefaultTextStyle under builder of our MaterialApp like so:
child: MaterialApp(      
  theme: yourThemeData,
  builder: (context, child) => DefaultTextStyle(
    style: yourThemeData.textTheme.bodyText1,
    child: child,
By doing so we don't need to specify a style or having DefaultTextTheme every time we want to use showDialog or Overlay.
The text has a hidden default text style
.The problem arises because you can't provide this to any parent widget like Scaffold.
Text widget takes the default style.
for your solution either you can change the DefaultTextStyle like this.
DefaultTextStyle(
    style: TextStyle(),
    child: yourTextWidget,
or just wrap into Scaffold, Scaffold is a widget. that provides scaffolding
for pages in your app.
like this
 MaterialApp(
  home: Scaffold(
    body: Text('Wakey Wakey!'),
for more info just walk through this Flutter Official video.
Yellow underline text | Decoding Flutter
Use a DefaultTextStyle() widget to set the textstyle of your text.
DefaultTextStyle(
  style: kTempTextStyle,
  child: Text('Hello world'),
you can give your own textstyle as you want.
const kTempTextStyle = TextStyle(
  fontFamily: 'Spartan MB',
  fontSize: 100.0,
  decoration: null,
        
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