Bug fixes: fixed crash with checkbox

lib/cyberarm_engine/ui/check_box.rb

@@ -9,7 +9,7 @@ module CyberarmEngine
       @x, @y = x, y
       @checked = checked
       @size = size
-      @text = Text.new("✔", false, x: x, y: y, size: size, color: BUTTON_TEXT_COLOR, shadow: true)
+      @text = Text.new("✔", x: x, y: y, size: size, color: BUTTON_TEXT_COLOR, shadow: true)
       return self
     end
 
@@ -55,8 +55,8 @@ module CyberarmEngine
     end
 
     def mouse_over?
-      if $window.mouse.x.between?(@x, @x+width)
-        if $window.mouse.y.between?(@y, @y+height)
+      if $window.mouse_x.between?(@x, @x+width)
+        if $window.mouse_y.between?(@y, @y+height)
           true
         end
       end

lib/cyberarm_engine/ui/container.rb

@@ -114,7 +114,7 @@ module CyberarmEngine
     end
 
     # Fills container background with color
-    def fill(color = Gosu::Color::BLACK, z = 0)
+    def fill(color = Gosu::Color::BLACK, z = -1)
       $window.draw_rect(@x, @y, @width, @height, color, z)
     end
 
@@ -132,12 +132,12 @@ module CyberarmEngine
 
     # Return X position relative to container
     def relative_x(int)
-      int-self.x
+      self.x+int
     end
 
     # Return Y position relative to container
     def relative_y(int)
-      int-self.y
+      self.y+int
     end
 
     def calc_percentage(positive, total)