import 'dart:math'; import 'package:flutter/material.dart'; class OnePageCard extends StatelessWidget { final Widget child; const OnePageCard({Key key, this.child}) : super(key: key); static const int alpha = 16; @override Widget build(BuildContext context) { return MediaQuery.of(context).size.width <= 600 ? child : Container( decoration: BoxDecoration( color: Theme.of(context).backgroundColor, gradient: LinearGradient( begin: Alignment.topRight, end: Alignment.bottomLeft, stops: [ 0.1, 0.4, 0.6, 0.9, ], colors: [ Theme.of(context).secondaryHeaderColor.withAlpha(alpha), Theme.of(context).primaryColor.withAlpha(alpha), Theme.of(context).accentColor.withAlpha(alpha), Theme.of(context).backgroundColor.withAlpha(alpha), ], ), ), padding: EdgeInsets.symmetric( horizontal: max((MediaQuery.of(context).size.width - 600) / 2, 12), vertical: max((MediaQuery.of(context).size.height - 800) / 2, 12), ), child: SafeArea(child: Card(child: child)), ); } }