Having trouble in customizing text, text position, fontweight and etc - flutter

Question

I'm having trouble customizing the font aspects, and position of my text in the code below. I want to put 'Bula Anvisa', centralized and bold, with a clickable link to its specific documents online. I begin "coding" this app in appinventor, there I had almost everything in order, but with flutter it's being very hard, although I'm loving learning this language. This is my first app and experience with code. After everything is in order, I'd like to make it a beautiful and fluid app. One step at a time.
I'm receiving the message
Too many positional arguments: 0 allowed, but 1 found.
Try removing the extra positional arguments.
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
class analgesicos extends StatefulWidget {
const analgesicos({Key? key}) : super(key: key);
#override
State<analgesicos> createState() => _analgesicosState();
}
class _analgesicosState extends State<analgesicos> {
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
appBar: AppBar(
backgroundColor: Colors.teal,
centerTitle: true,
title: Text('Analgésicos',style: TextStyle(
fontFamily: 'fonts/Quicksand-Light.ttf',
fontSize: 22,
),),
),
body: Container(
constraints: const BoxConstraints(minHeight: 0, maxHeight: 200.0),
child: (
Column(crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Padding(padding: const EdgeInsets.only(top: 10, bottom: 10),),
Container(width: 240.0,
height: 42.0,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(20.0),
color: const Color(0xffc5fce1),
),
child: SizedBox(
child: Text(
'Não-opióides',
style: TextStyle(
fontFamily: 'Quicksand',
fontSize: 18,
color: Colors.black,
height: 1.7,
),
textAlign: TextAlign.center,
),
),
),
Divider(
height: 15),
const Material(
child: (const Card(
child: ListTile(
title: Text('Ácido acetilsalicílico'),
subtitle: Text('''Apresentação: Comprimidos simples de 500 ou 650 mg
Indicação: Antipirético e analgésico.
Posologia odontológica: Uso interno (via oral)
Tomar 1 comprimido de 6/6 horas.'''),
),
)),
),
const Material(
child: (const Card(
color: Colors.white,
child: ListTile(
title: Text('Bula ANVISA'),
),
)),
),
],)
),
),
);
}
}