Implement custom copy notification

When copying a message in chat, a notification will now show under the
video rather than the block the textfield.

lib/widgets/alert_message.dart

@@ -4,11 +4,13 @@ import 'package:flutter/material.dart';
 class AlertMessage extends StatelessWidget {
   final String message;
   final IconData icon;
+  final Color? color;
 
   const AlertMessage({
     Key? key,
     required this.message,
     final this.icon = Icons.info,
+    this.color,
   }) : super(key: key);
 
   @override
@@ -18,15 +20,15 @@ class AlertMessage extends StatelessWidget {
       children: [
         Icon(
           icon,
-          color: Colors.grey,
+          color: color ?? Colors.grey,
         ),
         const SizedBox(width: 5.0),
         Flexible(
           child: Text(
             message,
-            style: const TextStyle(
+            style: TextStyle(
               fontWeight: FontWeight.w500,
-              color: Colors.grey,
+              color: color ?? Colors.grey,
             ),
           ),
         ),

lib/widgets/button.dart

@@ -40,7 +40,7 @@ class _ButtonState extends State<Button> with SingleTickerProviderStateMixin {
       onPrimary: widget.fill ? null : widget.color,
       padding: widget.padding,
       splashFactory: Platform.isIOS ? NoSplash.splashFactory : null,
-      textStyle: TextStyle(fontWeight: FontWeight.bold, fontSize: widget.fontSize),
+      textStyle: TextStyle(fontWeight: FontWeight.w600, fontSize: widget.fontSize),
       shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(30.0)),
       elevation: widget.color == null ? 10.0 : 0.0,
     ).copyWith(