Update Themes.axaml

Author: wieslawsoltes

src/ChatGPT.UI/Themes/Themes.axaml

@@ -2,7 +2,7 @@
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
   <ResourceDictionary.ThemeDictionaries>
     <ResourceDictionary x:Key='Default'>
-      <SolidColorBrush x:Key='HeaderBackgroundBrush'>#66FFFFFF</SolidColorBrush>
+      <SolidColorBrush x:Key='HeaderBackgroundBrush'>#C5FFFFFF</SolidColorBrush>
       <SolidColorBrush x:Key='HeaderBorderBrush'>#40000000</SolidColorBrush>
       <SolidColorBrush x:Key='MessageBackgroundBrush'>#C5FFFFFF</SolidColorBrush>
       <SolidColorBrush x:Key='MessageBorderBrush'>#40000000</SolidColorBrush>
@@ -23,7 +23,7 @@
       <x:Double x:Key='SettingContentFontSize'>14</x:Double>
     </ResourceDictionary>
     <ResourceDictionary x:Key='Dark'>
-      <SolidColorBrush x:Key='HeaderBackgroundBrush'>#66000000</SolidColorBrush>
+      <SolidColorBrush x:Key='HeaderBackgroundBrush'>#C5303030</SolidColorBrush>
       <SolidColorBrush x:Key='HeaderBorderBrush'>#40FFFFFF</SolidColorBrush>
       <SolidColorBrush x:Key='MessageBackgroundBrush'>#C5303030</SolidColorBrush>
       <SolidColorBrush x:Key='MessageBorderBrush'>#40FFFFFF</SolidColorBrush>