diff --git a/src/formatters/ansi.cr b/src/formatters/ansi.cr
index ba8b740..16d9e79 100644
--- a/src/formatters/ansi.cr
+++ b/src/formatters/ansi.cr
@@ -26,7 +26,7 @@ module Tartrazine
         }]
       end
       colorized = text.colorize
-      s.color.try { |c| colorized = colorized.fore(c.colorize) }
+      s.color.try { |col| colorized = colorized.fore(col.colorize) }
       # Intentionally not setting background color
       colorized.mode(:bold) if s.bold
       colorized.mode(:italic) if s.italic
diff --git a/src/formatters/html.cr b/src/formatters/html.cr
index 3f3510e..e978649 100644
--- a/src/formatters/html.cr
+++ b/src/formatters/html.cr
@@ -5,8 +5,8 @@ module Tartrazine
     # Not all of these options are implemented
 
     property? standalone : Bool = false
+    property class_prefix : String = ""
 
-    # property class_prefix : String = ""
     # property with_classes : Bool = true
     # property tab_width = 8
     # property surrounding_pre : Bool = true
@@ -76,13 +76,13 @@ module Tartrazine
 
     # Given a token type, return the CSS class to use.
     def get_css_class(token, theme)
-      return Abbreviations[token] if theme.styles.has_key?(token)
+      return class_prefix + Abbreviations[token] if theme.styles.has_key?(token)
 
       # Themes don't contain information for each specific
       # token type. However, they may contain information
       # for a parent style. Worst case, we go to the root
       # (Background) style.
-      Abbreviations[theme.style_parents(token).reverse.find { |parent|
+      class_prefix + Abbreviations[theme.style_parents(token).reverse.find { |parent|
         theme.styles.has_key?(parent)
       }]
     end
diff --git a/src/main.cr b/src/main.cr
index 9fd7c5d..ab27cfd 100644
--- a/src/main.cr
+++ b/src/main.cr
@@ -4,4 +4,5 @@ lexer = Tartrazine.lexer("crystal")
 theme = Tartrazine.theme(ARGV[1])
 formatter = Tartrazine::Html.new
 formatter.standalone = true
+formatter.class_prefix = "tartrazine-"
 puts formatter.format(File.read(ARGV[0]), lexer, theme)