diff --git a/EnvelopeGenerator.Web/Models/Annotation.cs b/EnvelopeGenerator.Web/Models/Annotation.cs
index 58262e7b..4032fca4 100644
--- a/EnvelopeGenerator.Web/Models/Annotation.cs
+++ b/EnvelopeGenerator.Web/Models/Annotation.cs
@@ -1,7 +1,13 @@
 namespace EnvelopeGenerator.Web.Models;
 
-public record Annotation(string? HorBoundAnnotName = null, string? VerBoundAnnotName = null)
+public class Annotation
 {
+    #region Bound Annotation
+    public string? HorBoundAnnotName { get; init; }
+
+    public string? VerBoundAnnotName { get; init; }
+    #endregion
+
     #region Layout
     internal double _marginX = default;
 
diff --git a/EnvelopeGenerator.Web/Models/AnnotationParams.cs b/EnvelopeGenerator.Web/Models/AnnotationParams.cs
index 9df111f3..4886a67a 100644
--- a/EnvelopeGenerator.Web/Models/AnnotationParams.cs
+++ b/EnvelopeGenerator.Web/Models/AnnotationParams.cs
@@ -1,6 +1,6 @@
 namespace EnvelopeGenerator.Web.Models;
 
-public class AnnotationParams
+public class AnnotationParams: Annotation
 {
     private readonly Dictionary<string, Annotation> _annots = new();
 
@@ -9,15 +9,31 @@ public class AnnotationParams
         get => _annots;
         init
         {
-            // set bound annotations
+            _annots = value;
+
             foreach (var name in _annots.Keys)
             {
+                #region set default values
+                if (_annots[name]._marginX == default)
+                    _annots[name]._marginX = MarginX;
+
+                if (_annots[name]._marginY == default)
+                    _annots[name]._marginY = MarginY;
+
+                if (_annots[name]._width == default)
+                    _annots[name]._width = Width;
+
+                if (_annots[name]._height == default)
+                    _annots[name]._height = Height;
+                #endregion
+
+                #region set bound annotations
                 // horizontal
                 if (_annots[name].HorBoundAnnotName is string horBoundAnnotName)
                     if (_annots.TryGetValue(horBoundAnnotName, out var horBoundAnnot))
                         _annots[name].HorBoundAnnot = horBoundAnnot;
-                else
-                    throw new InvalidOperationException($"{horBoundAnnotName} added as bound anotation. However, it is not defined.");
+                    else
+                        throw new InvalidOperationException($"{horBoundAnnotName} added as bound anotation. However, it is not defined.");
 
                 // vertical
                 if (_annots[name].VerBoundAnnotName is string verBoundAnnotName)
@@ -25,6 +41,7 @@ public class AnnotationParams
                         _annots[name].VerBoundAnnot = verBoundAnnot;
                     else
                         throw new InvalidOperationException($"{verBoundAnnotName} added as bound anotation. However, it is not defined.");
+                #endregion
             }
         }
     }
diff --git a/EnvelopeGenerator.Web/appsettings.json b/EnvelopeGenerator.Web/appsettings.json
index 994141a1..3bf5e281 100644
--- a/EnvelopeGenerator.Web/appsettings.json
+++ b/EnvelopeGenerator.Web/appsettings.json
@@ -152,7 +152,15 @@
   "MainPageTitle": null,
   "AnnotationParams": {
     "Annotations": {
+      "Signature": {
 
+      },
+      "City": {
+
+      },
+      "Date": {
+
+      }
     }
   }
 }