Flutter - Implementing CSS Radial Gradients

Flutter - Implementing CSS radial gradients

You need to use the center property of the RadialGradient to position the gradient.

Use the code below and it should give you the same design in Flutter as the CSS code:

 gradient: RadialGradient(
      center: Alignment(-0.8, -0.6),
      colors: [
        Color.fromRGBO(3, 235, 255, 1),
        Color.fromRGBO(152, 70, 242, 1)
      ],
      radius: 1.0,
    ),

PS: I came up with the values -0.8 and -0.6 from the docs:

Alignment(0.0, 0.0) represents the center of the rectangle. The distance from -1.0 to +1.0 is the distance from one side of the rectangle to the other side of the rectangle. Therefore, 2.0 units horizontally (or vertically) is equivalent to the width (or height) of the rectangle.

So that means 10% from your CSS code would correspond to -0.8, 20% would be -0.6, and so on.

How to convert css rules to flutter style

Do like this:

return Scaffold(
    appBar: AppBar(title: Text("Title")),
    body: Container(
        padding: EdgeInsets.all(20),
        width: double.infinity,
        decoration: BoxDecoration(
            gradient: LinearGradient(
                begin: Alignment.centerRight,
                end: Alignment.centerLeft,
                colors: [Color(0xff03737D), Color(0xff14373A)]
                )
            ),
        height: 60,
        child: Text("Checking gradient bg", style: TextStyle(color: Colors.white)),
));

CSS output:

Flutter output:

How to apply Linear gradient on box decoration in flutter?

A solution would be to Stack your current Container (with the LinearGradient and the Container child) on top of another Container defining the BoxShadow and the DecorationImage:

import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      title: 'Scan with Time',
      home: Scaffold(
        body: MyWidget(),
      ),
    ),
  );
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      padding: EdgeInsets.all(10.0),
      width: 240,
      height: 480,
      child: Stack(
        children: [
          Positioned.fill(
            child: Container(
              padding: EdgeInsets.all(10.0),
              decoration: BoxDecoration(
                borderRadius: BorderRadius.all(Radius.circular(20)),
                boxShadow: [
                  BoxShadow(
                    color: Colors.blueGrey,
                    blurRadius: 5,
                    offset: Offset(0, 7),
                  ),
                ],
                image: DecorationImage(
                  image: NetworkImage(
                      'https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/Old_man_reading_news_paper_early_in_the_morning_at_Basantapur-IMG_6800.jpg/1280px-Old_man_reading_news_paper_early_in_the_morning_at_Basantapur-IMG_6800.jpg'),
                  fit: BoxFit.cover,
                ),
              ),
            ),
          ),
          Positioned.fill(
            child: Container(
              padding: EdgeInsets.all(10.0),
              decoration: BoxDecoration(
                borderRadius: BorderRadius.all(Radius.circular(20)),
                gradient: LinearGradient(
                  colors: [
                    Colors.red,
                    Colors.transparent,
                    Colors.transparent,
                    Colors.red
                  ],
                  begin: Alignment.topCenter,
                  end: Alignment.bottomCenter,
                  stops: [0, 0, 0.6, 1],
                ),
              ),
              child: Column(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                crossAxisAlignment: CrossAxisAlignment.end,
                children: <Widget>[
                  Container(
                    //place this container to right side
                    constraints: BoxConstraints(maxWidth: 240.0),
                    padding: EdgeInsets.all(5),
                    decoration: BoxDecoration(
                        borderRadius: BorderRadius.circular(8.0),
                        color: Colors.white.withOpacity(0.8)),
                    child: Row(
                      children: [
                        Icon(
                          Icons.directions_bike,
                          color: Colors.red,
                        ),
                        Text(
                          '5',
                          style: TextStyle(
                            color: Colors.red,
                            fontWeight: FontWeight.bold,
                            fontSize: 17.0,
                          ),
                        ),
                      ],
                    ),
                  ),

                  //display event name, start/end dates times and duration in a column
                  Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text('NAME',
                          style: TextStyle(
                              color: Colors.white,
                              fontWeight: FontWeight.bold,
                              fontSize: 20.0)),
                      SizedBox(
                        height: 3.0,
                      ),
                    ],
                  ),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }
}

wrapping Scaffold with Container for gradient background, How to set gradient to container background in flutter?

In Your Code - Under Scaffold add - backgroundColor: Colors.transparent,

child: Scaffold(
        backgroundColor: Colors.transparent,
        appBar: AppBar(
        ..

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