bugfix: Fix flex overflow, add own padding and alignment option for buttons

Closes: #14

lib/src/auth_screen.dart

@@ -16,6 +16,7 @@ class AuthScreen extends StatefulWidget {
     required this.previousBtnTitle,
     required this.onFinish,
     this.customAppBar,
+    this.buttonMainAxisAlignment,
     this.customBackgroundColor,
     this.nextButtonBuilder,
     this.previousButtonBuilder,
@@ -38,6 +39,7 @@ class AuthScreen extends StatefulWidget {
   final String nextBtnTitle;
   final String previousBtnTitle;
   final AppBar? customAppBar;
+  final MainAxisAlignment? buttonMainAxisAlignment;
   final Color? customBackgroundColor;
   final Widget Function(Future<void> Function()? onPressed, String label,
       int step, bool enabled)? nextButtonBuilder;
@@ -170,7 +172,7 @@ class _AuthScreenState extends State<AuthScreen> {
                       ),
                     ),
                   ],
-                  Expanded(
+                  Flexible(
                     flex: widget.formFlex ?? 3,
                     child: Column(
                       children: [
@@ -191,33 +193,22 @@ class _AuthScreenState extends State<AuthScreen> {
                       ],
                     ),
                   ),
-                  Padding(
+                  Column(
-                    padding: EdgeInsets.only(
-                      top: 15.0,
-                      bottom: 30.0,
-                      left: widget.previousButtonBuilder == null &&
-                              widget.steps.first != widget.steps[i]
-                          ? 30.0
-                          : 0.0,
-                      right: widget.nextButtonBuilder == null &&
-                              widget.previousButtonBuilder == null
-                          ? 30.0
-                          : 0.0,
-                    ),
-                    child: Column(
                     children: [
                       Row(
                         mainAxisAlignment:
-                              (widget.previousButtonBuilder != null &&
+                            widget.buttonMainAxisAlignment != null
+                                ? widget.buttonMainAxisAlignment!
+                                : (widget.previousButtonBuilder != null &&
                                         widget.previousButtonBuilder?.call(
                                               onPrevious,
                                               widget.previousBtnTitle,
                                               i,
                                             ) ==
                                             null)
-                                  ? MainAxisAlignment.spaceAround
+                                    ? MainAxisAlignment.start
                                     : widget.steps.first != widget.steps[i]
-                                      ? MainAxisAlignment.spaceBetween
+                                        ? MainAxisAlignment.center
                                         : MainAxisAlignment.end,
                         children: [
                           if (widget.previousButtonBuilder == null) ...[
@@ -231,8 +222,7 @@ class _AuthScreenState extends State<AuthScreen> {
                                       size: 18,
                                     ),
                                     Padding(
-                                        padding:
+                                      padding: const EdgeInsets.only(left: 4.0),
-                                            const EdgeInsets.only(left: 4.0),
                                       child: Text(widget.previousBtnTitle),
                                     ),
                                   ],
@@ -288,7 +278,6 @@ class _AuthScreenState extends State<AuthScreen> {
                         ),
                     ],
                   ),
-                  ),
                 ],
               ),
           ],

lib/src/config/registration_options.dart

@@ -17,6 +17,7 @@ class RegistrationOptions {
     this.customAppbarBuilder,
     this.nextButtonBuilder,
     this.previousButtonBuilder,
+    this.buttonMainAxisAlignment,
     this.backgroundColor,
     this.titleWidget,
     this.loginButton,
@@ -32,6 +33,7 @@ class RegistrationOptions {
       int step, bool enabled)? nextButtonBuilder;
   final Widget? Function(VoidCallback onPressed, String label, int step)?
       previousButtonBuilder;
+  final MainAxisAlignment? buttonMainAxisAlignment;
   final Color? backgroundColor;
   Widget? titleWidget;
   Widget? loginButton;

lib/src/registration_screen.dart

@@ -52,6 +52,7 @@ class RegistrationScreen extends StatelessWidget {
       previousBtnTitle: translations.previousStepBtn,
       nextButtonBuilder: registrationOptions.nextButtonBuilder,
       previousButtonBuilder: registrationOptions.previousButtonBuilder,
+      buttonMainAxisAlignment: registrationOptions.buttonMainAxisAlignment,
       customBackgroundColor: registrationOptions.backgroundColor,
       titleWidget: registrationOptions.titleWidget,
       loginButton: registrationOptions.loginButton,