vocabs.prettyprint: made the auto-use vocab box a little easier to read

basis/colors/constants/factor-colors.txt

@@ -1,4 +1,5 @@
 ! Factor UI theme colors
+243 242 234		FactorLightLightTan
 227 226 219		FactorLightTan
 172 167 147		FactorDarkTan
  81  91 105		FactorLightSlateBlue

basis/vocabs/prettyprint/prettyprint.factor

@@ -4,6 +4,7 @@ USING: accessors arrays assocs colors colors.constants fry io
 io.styles kernel make math.order namespaces parser
 prettyprint.backend prettyprint.sections prettyprint.stylesheet
 sequences sets sorting vocabs vocabs.parser ;
+FROM: io.styles => inset ;
 IN: vocabs.prettyprint
 
 : pprint-vocab ( vocab -- )
@@ -86,7 +87,9 @@ PRIVATE>
         "To avoid doing this in the future, add the following forms" print
         "at the top of the source file:" print nl
     ] with-style
-    { { page-color COLOR: FactorLightTan } }
+    { { page-color COLOR: FactorLightLightTan }
+      { border-color COLOR: FactorDarkTan }
+      { inset { 5 5 } } }
     [ manifest get pprint-manifest ] with-nesting
     nl nl
 ] print-use-hook set-global