diff --git a/lib/cyberarm_engine/ui/container.rb b/lib/cyberarm_engine/ui/container.rb
index 1fa43ab..611959f 100644
--- a/lib/cyberarm_engine/ui/container.rb
+++ b/lib/cyberarm_engine/ui/container.rb
@@ -31,7 +31,9 @@ module CyberarmEngine
     end
 
     def render
+      Gosu.clip_to(@x, @y, width, height) do
         @children.each(&:draw)
+      end
     end
 
     def update
@@ -61,13 +63,16 @@ module CyberarmEngine
       layout
 
       if is_root?
-        @style.width  = window.width
-        @style.height = window.height
+        @width  = @style.width  = window.width
+        @height = @style.height = window.height
       else
-        @style.width  = @max_width  ? @max_width  : (@children.map {|c| c.x + c.outer_width }.max || 0).round
-        @style.height = @max_height ? @max_height : (@children.map {|c| c.y + c.outer_height}.max || 0).round
+        _width = dimensional_size(@style.width, :width)
+        _height= dimensional_size(@style.height,:height)
+        @width  = _width  ? _width  : (@children.map {|c| c.x + c.outer_width }.max || 0).round
+        @height = _height ? _height : (@children.map {|c| c.y + c.outer_height}.max || 0).round
       end
 
+
       # Move child to parent after positioning
       @children.each do |child|
         child.x += @x
diff --git a/lib/cyberarm_engine/ui/edit_line.rb b/lib/cyberarm_engine/ui/edit_line.rb
index d82d6e2..fce8b4a 100644
--- a/lib/cyberarm_engine/ui/edit_line.rb
+++ b/lib/cyberarm_engine/ui/edit_line.rb
@@ -79,7 +79,7 @@ module CyberarmEngine
     def recalculate
       super
 
-      @style.width = default(:width)
+      @width = dimensional_size(@style.width, :width) || default(:width)
       update_background
     end
 
diff --git a/lib/cyberarm_engine/ui/element.rb b/lib/cyberarm_engine/ui/element.rb
index 8af35fd..61b1bf4 100644
--- a/lib/cyberarm_engine/ui/element.rb
+++ b/lib/cyberarm_engine/ui/element.rb
@@ -23,11 +23,14 @@ module CyberarmEngine
       @y = @style.y
       @z = @style.z
 
+      @width  = 0
+      @height = 0
+
       @fixed_x = @x if @x != 0
       @fixed_y = @y if @y != 0
 
-      @style.width  = default(:width)  || $window.width
-      @style.height = default(:height) || $window.height
+      @style.width  = default(:width)  || nil
+      @style.height = default(:height) || nil
 
       stylize
 
@@ -159,7 +162,7 @@ module CyberarmEngine
 
     def width
       if visible?
-        (@style.border_thickness_left + @style.padding_left) + @style.width + (@style.padding_right + @style.border_thickness_right)
+        (@style.border_thickness_left + @style.padding_left) + @width + (@style.padding_right + @style.border_thickness_right)
       else
         0
       end
@@ -171,7 +174,7 @@ module CyberarmEngine
 
     def height
       if visible?
-        (@style.border_thickness_top + @style.padding_top) + @style.height + (@style.padding_bottom + @style.border_thickness_bottom)
+        (@style.border_thickness_top + @style.padding_top) + @height + (@style.padding_bottom + @style.border_thickness_bottom)
       else
         0
       end
@@ -181,6 +184,19 @@ module CyberarmEngine
       @style.margin_top + height + @style.margin_bottom
     end
 
+    private def dimensional_size(size, dimension)
+      raise "dimension must be either :width or :height" unless dimension == :width || dimension == :height
+      if size && size.is_a?(Numeric)
+        if size.between?(0.0, 1.0)
+          @parent.send(:"#{dimension}") * size
+        else
+          size
+        end
+      else
+        nil
+      end
+    end
+
     def background=(_background)
       @style.background_canvas.background=(_background)
       update_background
diff --git a/lib/cyberarm_engine/ui/image.rb b/lib/cyberarm_engine/ui/image.rb
index 5134632..734d772 100644
--- a/lib/cyberarm_engine/ui/image.rb
+++ b/lib/cyberarm_engine/ui/image.rb
@@ -5,21 +5,7 @@ module CyberarmEngine
       @path = path
 
       @image = Gosu::Image.new(path, retro: @options[:image_retro])
-      if @options[:width] && @options[:height]
-        @scale_x = @options[:width].to_f / @image.width
-        @scale_y = @options[:height].to_f / @image.height
-      elsif @options[:width]
-        @scale_x = @options[:width].to_f / @image.width
-        @scale_y = @scale_x
-      elsif @options[:height]
-        @scale_y = @options[:height].to_f / @image.height
-        @scale_x = @scale_y
-      else
-        @scale_x, @scale_y = 1, 1
-      end
-
-      raise "Scale X" unless @scale_x.is_a?(Numeric)
-      raise "Scale Y" unless @scale_y.is_a?(Numeric)
+      @scale_x, @scale_y = 1, 1
     end
 
     def render
@@ -35,8 +21,24 @@ module CyberarmEngine
     end
 
     def recalculate
-      @style.width  = @image.width * @scale_x
-      @style.height = @image.height * @scale_y
+      _width = dimensional_size(@style.width, :width)
+      _height= dimensional_size(@style.height,:height)
+
+      if _width && _height
+        @scale_x = _width.to_f / @image.width
+        @scale_y = _height.to_f / @image.height
+      elsif _width
+        @scale_x = _width.to_f / @image.width
+        @scale_y = @scale_x
+      elsif _height
+        @scale_y = _height.to_f / @image.height
+        @scale_x = @scale_y
+      else
+        @scale_x, @scale_y = 1, 1
+      end
+
+      @width = _width  ? _width  : @image.width.round * @scale_x
+      @height= _height ? _height : @image.height.round * @scale_y
     end
 
     def value
diff --git a/lib/cyberarm_engine/ui/label.rb b/lib/cyberarm_engine/ui/label.rb
index c713113..6fefc56 100644
--- a/lib/cyberarm_engine/ui/label.rb
+++ b/lib/cyberarm_engine/ui/label.rb
@@ -17,8 +17,10 @@ module CyberarmEngine
     end
 
     def recalculate
-      @style.width = @text.width.round
-      @style.height= @text.height.round
+      _width = dimensional_size(@style.width, :width)
+      _height= dimensional_size(@style.height,:height)
+      @width = _width  ? _width  : @text.width.round
+      @height= _height ? _height : @text.height.round
 
       @text.x = @style.border_thickness_left + @style.padding_left + @x
       @text.y = @style.border_thickness_top + @style.padding_top  + @y