fix button alignment

Frontend/lib/mih_packages/patient_profile/pat_profile/package_tools/patient_documents.dart

@@ -238,6 +238,7 @@ class _PatientDocumentsState extends State<PatientDocuments> {
                   ? EdgeInsets.symmetric(horizontal: width * 0.05)
                   : const EdgeInsets.symmetric(horizontal: 0),
           child: Column(
+            mainAxisAlignment: MainAxisAlignment.center,
             children: [
               MihForm(
                 formKey: _formKey,
@@ -298,7 +299,8 @@ class _PatientDocumentsState extends State<PatientDocuments> {
                     ],
                   ),
                   const SizedBox(height: 20),
-                  MihButton(
+                  Center(
+                    child: MihButton(
                       onPressed: () {
                         if (_formKey.currentState!.validate()) {
                           submitDocUploadForm();
@@ -322,6 +324,7 @@ class _PatientDocumentsState extends State<PatientDocuments> {
                         ),
                       ),
                     ),
+                  ),
                 ],
               ),
             ],