diff --git a/lib/cyberarm_engine/ui/element.rb b/lib/cyberarm_engine/ui/element.rb
index 307f390..a7b9afb 100644
--- a/lib/cyberarm_engine/ui/element.rb
+++ b/lib/cyberarm_engine/ui/element.rb
@@ -212,7 +212,7 @@ module CyberarmEngine
       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(:"content_#{dimension}") - self.send(:"noncontent_#{dimension}") - 1) * size
+          ((@parent.send(:"content_#{dimension}") - self.send(:"noncontent_#{dimension}") - 1) * size).round
         else
           size
         end
diff --git a/lib/cyberarm_engine/ui/theme.rb b/lib/cyberarm_engine/ui/theme.rb
index 76728df..1a3ad73 100644
--- a/lib/cyberarm_engine/ui/theme.rb
+++ b/lib/cyberarm_engine/ui/theme.rb
@@ -112,7 +112,7 @@ module CyberarmEngine
         height: 36,
         background: 0xff111111,
         fraction_background: [0xffc75e61, 0xffe26623],
-        border_thickness: 4,
+        border_thickness: 1,
         border_color: [0xffd59674, 0xffff8746]
       }
     }.freeze