diff --git a/TestGame/TestGame.cs b/TestGame/TestGame.cs
index b284338..3756c1d 100644
--- a/TestGame/TestGame.cs
+++ b/TestGame/TestGame.cs
@@ -20,6 +20,7 @@ public class TestGame : Game
         InitializeSystemsDefault();
 
         _uiSystem = new UISystem(new ResourceRef<Style>(Guid.Empty));
+        _uiSystem.RenderDebugRects = true;
 
         _particleSystem = new ParticleSystem();
 
diff --git a/Voile/Source/Rendering/RaylibRenderSystem.cs b/Voile/Source/Rendering/RaylibRenderSystem.cs
index 59f3e4a..83a287d 100644
--- a/Voile/Source/Rendering/RaylibRenderSystem.cs
+++ b/Voile/Source/Rendering/RaylibRenderSystem.cs
@@ -187,6 +187,17 @@ namespace Voile.Rendering
             }, transformPivot, transformRotation, VoileColorToRaylibColor(color));
         }
 
+        public override void DrawRectangleOutline(Vector2 size, Color color, float outlineWidth = 1)
+        {
+            Raylib.DrawRectangleLinesEx(new Rectangle()
+            {
+                X = transformPosition.X,
+                Y = transformPosition.Y,
+                Width = size.X,
+                Height = size.Y
+            }, outlineWidth, VoileColorToRaylibColor(color));
+        }
+
         public override void DrawDebugText(string text, int fontSize, Color color)
         {
             Raylib.DrawText(text, (int)transformPosition.X, (int)transformPosition.Y, fontSize, VoileColorToRaylibColor(color));
diff --git a/Voile/Source/Rendering/RenderSystem.cs b/Voile/Source/Rendering/RenderSystem.cs
index 936c288..5665369 100644
--- a/Voile/Source/Rendering/RenderSystem.cs
+++ b/Voile/Source/Rendering/RenderSystem.cs
@@ -180,6 +180,9 @@ namespace Voile.Rendering
         /// <param name="size">Rectangle size.</param>
         /// <param name="color">Fill color.</param>
         public abstract void DrawRectangle(Vector2 size, Color color);
+
+        public abstract void DrawRectangleOutline(Vector2 size, Color color, float outlineWidth = 1.0f);
+
         /// <summary>
         /// Draws a debug text with a default font.
         /// </summary>
diff --git a/Voile/Source/Rendering/StandardRenderSystem.cs b/Voile/Source/Rendering/StandardRenderSystem.cs
index 2202e9c..7bede5c 100644
--- a/Voile/Source/Rendering/StandardRenderSystem.cs
+++ b/Voile/Source/Rendering/StandardRenderSystem.cs
@@ -399,6 +399,11 @@ namespace Voile.Rendering
             throw new NotImplementedException();
         }
 
+        public override void DrawRectangleOutline(Vector2 size, Color color, float outlineWidth = 1)
+        {
+            throw new NotImplementedException();
+        }
+
         private Vector2 _windowSize = Vector2.Zero;
         private IWindow? _window;
 
diff --git a/Voile/Source/UI/Containers/Container.cs b/Voile/Source/UI/Containers/Container.cs
index aaabd98..0393e95 100644
--- a/Voile/Source/UI/Containers/Container.cs
+++ b/Voile/Source/UI/Containers/Container.cs
@@ -1,29 +1,40 @@
 using System.Numerics;
+using Voile.Rendering;
 
 namespace Voile.UI.Containers;
 
 /// <summary>
 /// A base class for all UI containers, used to position and rendering child <see cref="IElement">s.
 /// </summary>
-public abstract class Container : IElement, IParentableElement, IUpdatableElement
+public abstract class Container : IElement, IParentableElement, IUpdatableElement, IResizeableElement, IRenderableElement
 {
     public IReadOnlyList<IElement> Children => _children;
     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 Container()
     {
 
     }
 
-    public Container(List<IElement> children)
+    public Container(Rect minimumSize)
     {
+        MinimumRect = minimumSize;
+    }
+
+    public Container(Rect minimumSize, List<IElement> children)
+    {
+        MinimumRect = minimumSize;
         _children = children;
     }
 
     public void Update()
     {
         Arrange();
+        CalculateMinimumSize();
+
         foreach (var child in _children)
         {
             if (child is not IUpdatableElement updatable) continue;
@@ -32,11 +43,59 @@ public abstract class Container : IElement, IParentableElement, IUpdatableElemen
     }
     public abstract void Arrange();
 
+    public void CalculateMinimumSize()
+    {
+        if (Children.Count == 0)
+        {
+            Size = MinimumRect;
+            return;
+        }
+
+        float minX = float.MaxValue;
+        float minY = float.MaxValue;
+        float maxX = float.MinValue;
+        float maxY = float.MinValue;
+
+        foreach (var child in Children)
+        {
+            var pos = child.Position;
+            var size = child.Size;
+
+            minX = MathF.Min(minX, pos.X);
+            minY = MathF.Min(minY, pos.Y);
+            maxX = MathF.Max(maxX, pos.X + size.Width);
+            maxY = MathF.Max(maxY, pos.Y + size.Height);
+        }
+
+        // Optionally apply padding
+        float padding = 0f; // or make this configurable
+
+        Size = new Rect(
+            maxX - minX + padding * 2,
+            maxY - minY + padding * 2
+        );
+    }
+
     public void AddChild(IElement child)
     {
         _children.Add(child);
         Update();
     }
 
+    public void Render(RenderSystem renderer, Style style)
+    {
+        foreach (var child in Children)
+        {
+            if (child is not IRenderableElement renderable) continue;
+            renderable.Render(renderer, style);
+        }
+    }
+
+    public void DrawSize(RenderSystem renderer)
+    {
+        renderer.SetTransform(Position, Vector2.Zero);
+        renderer.DrawRectangleOutline(new Vector2(Size.Width, Size.Height), Color.Red, 2.0f);
+    }
+
     private List<IElement> _children = new();
 }
\ No newline at end of file
diff --git a/Voile/Source/UI/Containers/GridContainer.cs b/Voile/Source/UI/Containers/GridContainer.cs
index 972c1f6..7c3c627 100644
--- a/Voile/Source/UI/Containers/GridContainer.cs
+++ b/Voile/Source/UI/Containers/GridContainer.cs
@@ -3,15 +3,14 @@ using Voile.Rendering;
 
 namespace Voile.UI.Containers;
 
-public class GridContainer : Container, IRenderableElement
+public class GridContainer : Container
 {
     public int Columns { get; set; } = 2;
     public float ColumnSpacing { get; set; } = 16.0f;
     public float RowSpacing { get; set; } = 16.0f;
-    public bool Visible { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
 
-    public GridContainer(List<IElement> children, int columns = 2, float colSpacing = 16.0f, float rowSpacing = 16.0f)
-        : base(children)
+    public GridContainer(Rect minimumSize, List<IElement> children, int columns = 2, float colSpacing = 16.0f, float rowSpacing = 16.0f)
+        : base(minimumSize, children)
     {
         Columns = columns;
         ColumnSpacing = colSpacing;
@@ -58,13 +57,4 @@ public class GridContainer : Container, IRenderableElement
             }
         }
     }
-
-    public void Render(RenderSystem renderer, Style style)
-    {
-        foreach (var child in Children)
-        {
-            if (child is not IRenderableElement renderable) continue;
-            renderable.Render(renderer, style);
-        }
-    }
 }
\ No newline at end of file
diff --git a/Voile/Source/UI/Containers/HorizontalContainer.cs b/Voile/Source/UI/Containers/HorizontalContainer.cs
index 9b43d90..3e8969b 100644
--- a/Voile/Source/UI/Containers/HorizontalContainer.cs
+++ b/Voile/Source/UI/Containers/HorizontalContainer.cs
@@ -3,12 +3,11 @@ using Voile.Rendering;
 
 namespace Voile.UI.Containers;
 
-public class HorizontalContainer : Container, IRenderableElement
+public class HorizontalContainer : Container
 {
     public float Spacing { get; set; } = 16.0f;
-    public bool Visible { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
 
-    public HorizontalContainer(List<IElement> children, float spacing = 16.0f) : base(children)
+    public HorizontalContainer(Rect minimumSize, List<IElement> children, float spacing = 16.0f) : base(minimumSize, children)
     {
         Spacing = spacing;
     }
@@ -36,13 +35,4 @@ public class HorizontalContainer : Container, IRenderableElement
             }
         }
     }
-
-    public void Render(RenderSystem renderer, Style style)
-    {
-        foreach (var child in Children)
-        {
-            if (child is not IRenderableElement renderable) continue;
-            renderable.Render(renderer, style);
-        }
-    }
 }
\ No newline at end of file
diff --git a/Voile/Source/UI/Containers/VerticalContainer.cs b/Voile/Source/UI/Containers/VerticalContainer.cs
index f090669..ebf6f3a 100644
--- a/Voile/Source/UI/Containers/VerticalContainer.cs
+++ b/Voile/Source/UI/Containers/VerticalContainer.cs
@@ -3,12 +3,11 @@ using Voile.Rendering;
 
 namespace Voile.UI.Containers;
 
-public class VerticalContainer : Container, IRenderableElement
+public class VerticalContainer : Container
 {
     public float Spacing { get; set; } = 16.0f;
-    public bool Visible { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
 
-    public VerticalContainer(List<IElement> children, float spacing = 16.0f) : base(children)
+    public VerticalContainer(Rect minimumSize, List<IElement> children, float spacing = 16.0f) : base(minimumSize, children)
     {
         Spacing = spacing;
     }
@@ -36,13 +35,4 @@ public class VerticalContainer : Container, IRenderableElement
             }
         }
     }
-
-    public void Render(RenderSystem renderer, Style style)
-    {
-        foreach (var child in Children)
-        {
-            if (child is not IRenderableElement renderable) continue;
-            renderable.Render(renderer, style);
-        }
-    }
 }
\ No newline at end of file
diff --git a/Voile/Source/UI/IElement.cs b/Voile/Source/UI/IElement.cs
index e9446c3..dbf7872 100644
--- a/Voile/Source/UI/IElement.cs
+++ b/Voile/Source/UI/IElement.cs
@@ -33,6 +33,7 @@ public interface IRenderableElement
 {
     public bool Visible { get; set; }
     public void Render(RenderSystem renderer, Style style);
+    public void DrawSize(RenderSystem renderer);
 }
 
 public interface IInputElement
diff --git a/Voile/Source/UI/UISystem.cs b/Voile/Source/UI/UISystem.cs
index 95a5766..a8bdc92 100644
--- a/Voile/Source/UI/UISystem.cs
+++ b/Voile/Source/UI/UISystem.cs
@@ -1,3 +1,4 @@
+using System.Numerics;
 using Voile.Rendering;
 using Voile.UI.Containers;
 
@@ -7,6 +8,8 @@ public class UISystem : IUpdatableSystem, IRenderableSystem
 {
     public IReadOnlyList<IElement> Elements => _elements;
 
+    public bool RenderDebugRects { get; set; }
+
     public UISystem(ResourceRef<Style> style)
     {
         _style = style;
@@ -37,6 +40,20 @@ public class UISystem : IUpdatableSystem, IRenderableSystem
             if (element is IRenderableElement renderable)
             {
                 renderable.Render(renderer, _style.Value);
+
+                if (!RenderDebugRects) return;
+                renderable.DrawSize(renderer);
+            }
+
+            if (element is IParentableElement parentable)
+            {
+                foreach (var child in parentable.Children)
+                {
+                    if (child is not IRenderableElement renderableChild) continue;
+
+                    if (!RenderDebugRects) return;
+                    renderableChild.DrawSize(renderer);
+                }
             }
         }
     }
diff --git a/Voile/Source/UI/Widgets/Widget.cs b/Voile/Source/UI/Widgets/Widget.cs
index 33c152a..c7c235a 100644
--- a/Voile/Source/UI/Widgets/Widget.cs
+++ b/Voile/Source/UI/Widgets/Widget.cs
@@ -32,6 +32,7 @@ public abstract class Widget : IElement, IRenderableElement, IInputElement, IRes
     /// </summary>
     /// <param name="renderer"></param>
     public abstract void Render(RenderSystem renderer, Style style);
+
     /// <summary>
     /// Called when this widget receives input.
     /// </summary>
@@ -45,4 +46,10 @@ public abstract class Widget : IElement, IRenderableElement, IInputElement, IRes
             Size = MinimumRect;
         }
     }
+
+    public void DrawSize(RenderSystem renderer)
+    {
+        renderer.SetTransform(Position, Vector2.Zero);
+        renderer.DrawRectangleOutline(new Vector2(Size.Width, Size.Height), Color.Red, 2.0f);
+    }
 }
\ No newline at end of file
diff --git a/Voile/Voile.csproj b/Voile/Voile.csproj
index 8ac836f..905aced 100644
--- a/Voile/Voile.csproj
+++ b/Voile/Voile.csproj
@@ -15,7 +15,7 @@
         <PackageReference Include="SoLoud.NET" Version="2020.2.7.1" />
         <PackageReference Include="Tommy" Version="3.1.2" />
         <PackageReference Include="ImGui.NET" Version="1.89.4" />
-        <PackageReference Include="Raylib-cs" Version="6.1.1" />
+        <PackageReference Include="Raylib-cs" Version="7.0.1" />
         <PackageReference Include="SharpFont" Version="4.0.1" />
         <PackageReference Include="SixLabors.Fonts" Version="1.0.0-beta19" />
         <PackageReference Include="StbImageSharp" Version="2.27.13" />