searchbar on ciphers page

src/App/Styles/Base.xaml

@@ -48,6 +48,16 @@
         <Setter Property="FontAttributes"
                 Value="Bold" />
     </Style>
+    <Style TargetType="SearchBar">
+        <Setter Property="BackgroundColor"
+                Value="Transparent" />
+        <Setter Property="TextColor"
+                Value="{StaticResource HeaderEntryTextColor}" />
+        <Setter Property="CancelButtonColor"
+                Value="{StaticResource HeaderEntryTextColor}" />
+        <Setter Property="PlaceholderColor"
+                Value="{StaticResource HeaderEntryPlaceholderColor}" />
+    </Style>
     
     <!-- Buttons -->
     <Style TargetType="Button"

src/App/Styles/Dark.xaml

@@ -17,6 +17,9 @@
 
     <Color x:Key="BoxBorderColor">#f0f0f0</Color>
     <Color x:Key="BoxHeaderTextColor">#3c8dbc</Color>
+    
+    <Color x:Key="HeaderEntryTextColor">#ffffff</Color>
+    <Color x:Key="HeaderEntryPlaceholderColor">#707070</Color>
 
     <Color x:Key="ListItemBorderColor">#f0f0f0</Color>
     <Color x:Key="ListHeaderTextColor">#3c8dbc</Color>

src/App/Styles/Light.xaml

@@ -18,6 +18,9 @@
     <Color x:Key="BoxBorderColor">#dddddd</Color>
     <Color x:Key="BoxHeaderTextColor">#3c8dbc</Color>
 
+    <Color x:Key="HeaderEntryTextColor">#ffffff</Color>
+    <Color x:Key="HeaderEntryPlaceholderColor">#c0dbeb</Color>
+
     <Color x:Key="ListItemBorderColor">#f0f0f0</Color>
     <Color x:Key="ListHeaderTextColor">#3c8dbc</Color>
 </ResourceDictionary>