diff --git a/TestGame/TestGame.cs b/TestGame/TestGame.cs
index 3756c1d..26a7828 100644
--- a/TestGame/TestGame.cs
+++ b/TestGame/TestGame.cs
@@ -73,9 +73,16 @@ public class TestGame : Game
             _container.AddChild(new RectangleWidget(new Rect(32.0f, 32.0f), MathUtils.RandomColor()));
         }
 
+        if (Input.IsActionPressed("cancel") && _container.Children.Count != 0)
+        {
+            var lastChild = _container.Children.Last();
+            _container.RemoveChild(lastChild);
+        }
+
         if (Input.IsMouseButtonDown(MouseButton.Left))
         {
-            _particleSystem.SetEmitterPosition(_emitterId, Input.GetMousePosition());
+            var mousePos = Input.GetMousePosition();
+            _container.Size = new Rect(mousePos.X, mousePos.Y);
         }
     }
 
@@ -118,5 +125,5 @@ public class TestGame : Game
     private ResourceRef<Sound> _sound;
     private ResourceRef<Texture2d> _icon;
 
-    private GridContainer _container = new();
+    private GridContainer _container = new(minimumSize: new Rect(64.0f, 64.0f), new());
 }
\ No newline at end of file
diff --git a/Voile/Source/Input/InputSystem.cs b/Voile/Source/Input/InputSystem.cs
index 578daca..a8b5584 100644
--- a/Voile/Source/Input/InputSystem.cs
+++ b/Voile/Source/Input/InputSystem.cs
@@ -137,6 +137,9 @@ namespace Voile.Input
             AddInputMapping("accept", [
                 new KeyInputAction(KeyboardKey.Enter),
             ]);
+            AddInputMapping("cancel", [
+                new KeyInputAction(KeyboardKey.Backspace),
+            ]);
         }
 
         protected bool TryGetInputMappings(string forAction, [NotNullWhen(true)] out List<IInputAction>? inputActions)
diff --git a/Voile/Source/UI/Containers/Container.cs b/Voile/Source/UI/Containers/Container.cs
index 0393e95..58ff889 100644
--- a/Voile/Source/UI/Containers/Container.cs
+++ b/Voile/Source/UI/Containers/Container.cs
@@ -12,7 +12,7 @@ public abstract class Container : IElement, IParentableElement, IUpdatableElemen
     public Vector2 Position { get; set; }
     public Rect MinimumRect { get; set; } = Rect.Zero;
     public Rect Size { get; set; } = Rect.Zero;
-    public bool Visible { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
+    public bool Visible { get; set; } = true;
 
     public Container()
     {
@@ -67,13 +67,15 @@ public abstract class Container : IElement, IParentableElement, IUpdatableElemen
             maxY = MathF.Max(maxY, pos.Y + size.Height);
         }
 
-        // Optionally apply padding
-        float padding = 0f; // or make this configurable
+        float padding = 0f;
 
-        Size = new Rect(
-            maxX - minX + padding * 2,
-            maxY - minY + padding * 2
-        );
+        float occupiedWidth = (maxX - minX) + padding * 2;
+        float occupiedHeight = (maxY - minY) + padding * 2;
+
+        float finalWidth = MathF.Max(occupiedWidth, MinimumRect.Width);
+        float finalHeight = MathF.Max(occupiedHeight, MinimumRect.Height);
+
+        Size = new Rect(finalWidth, finalHeight);
     }
 
     public void AddChild(IElement child)
@@ -82,6 +84,12 @@ public abstract class Container : IElement, IParentableElement, IUpdatableElemen
         Update();
     }
 
+    public void RemoveChild(IElement child)
+    {
+        _children.Remove(child);
+        Update();
+    }
+
     public void Render(RenderSystem renderer, Style style)
     {
         foreach (var child in Children)
diff --git a/Voile/Source/UI/IElement.cs b/Voile/Source/UI/IElement.cs
index dbf7872..26af153 100644
--- a/Voile/Source/UI/IElement.cs
+++ b/Voile/Source/UI/IElement.cs
@@ -14,6 +14,7 @@ public interface IParentableElement
 {
     public IReadOnlyList<IElement> Children { get; }
     public void AddChild(IElement child);
+    public void RemoveChild(IElement child);
 }
 
 public interface IResizeableElement