Nicer ansi rendering

src/actions.cr

@@ -4,6 +4,7 @@ require "./formatter"
 require "./rules"
 require "./styles"
 require "./tartrazine"
+
 # These are Lexer actions. When a rule matches, it will
 # perform a list of actions. These actions can emit tokens
 # or change the state machine.

src/formatter.cr

@@ -44,7 +44,12 @@ module Tartrazine
           theme.styles.has_key?(parent)
         }]
       end
-      text.colorize(*rgb(s.color)).back(*rgb(s.background)).to_s
+      colorized = text.colorize(*rgb(s.color))
+      # Intentionally not setting background color
+      colorized.mode(:bold) if s.bold
+      colorized.mode(:italic) if s.italic
+      colorized.mode(:underline) if s.underline
+      colorized.to_s
     end
 
     def rgb(c : String?)