Added modal widget

lib/functions/modal.dart

@@ -0,0 +1,38 @@
+import 'package:flutter/material.dart';
+import 'package:gap/gap.dart';
+import 'package:ocbo_esign_validator/widgets/text_widget.dart';
+
+void showModal(BuildContext context, String title, String message, bool error) {
+  showDialog(
+    context: context,
+    builder: (context) => Theme(
+      data: ThemeData(
+        dialogTheme: DialogThemeData(
+          backgroundColor: error
+              ? const Color.fromRGBO(72, 30, 31, 0.919)
+              : Color.fromRGBO(18, 44, 31, 0.919), // Check the value of `error`
+        ),
+      ),
+      child: AlertDialog(
+        title: TextWidget(text: title, color: Color.fromRGBO(244, 244, 244, 1), bold: true, size: 24),
+        content: SizedBox(
+          height: 48,
+          child: Column(
+            children: [
+              const Gap(24),
+              TextWidget(text: message, color: Color.fromRGBO(244, 244, 244, 1), size: 16),
+            ],
+          ),
+        ),
+        actions: [
+          TextButton(
+            onPressed: () {
+              Navigator.of(context).pop();
+            },
+            child: const TextWidget(text: 'OK', color: Colors.white, bold: true, size: 16),
+          ),
+        ],
+      ),
+    ),
+  );
+}