1 files changed, 1 insertions, 1 deletions

diff --git a/js/lex.js b/js/lex.js
index e98538c..7066ddb 100644
--- a/js/lex.js
+++ b/js/lex.js
@@ -16,7 +16,7 @@ Lex.prototype.build = function(){
 	this.span.innerHTML = this.html()
 }
 Lex.prototype.css = function(){
-	return "f" + letters[this.fg&15] + "b" + letters[this.bg&15]
+	return "f" + letters[mod(this.fg,16)] + "b" + letters[mod(this.bg,15)]
 }
 Lex.prototype.html = function(){
 	return this.char == " " ? " " : this.char || " "