diff --git a/garlic/doc/.gitignore b/garlic/doc/.gitignore
index b30e586..6d3a60e 100644
--- a/garlic/doc/.gitignore
+++ b/garlic/doc/.gitignore
@@ -2,3 +2,4 @@
 *.ascii
 *.html
 *.pdf
+grohtml*
diff --git a/garlic/doc/Makefile b/garlic/doc/Makefile
index 6d320b7..2831ca6 100644
--- a/garlic/doc/Makefile
+++ b/garlic/doc/Makefile
@@ -18,8 +18,9 @@ ug.pdf: ug.mm Makefile
 	groff -mm $(PREPROC) $(POSTPROC) $(REGISTERS) -dpaper=a4 -Tpdf $< > $@
 	-killall -HUP mupdf
 
-ug.xhtml: ug.mm Makefile
-	groff -mm $(PREPROC) $(POSTPROC) -Txhtml $< > $@
+%.html: %.ms Makefile
+	REFER=ref.i groff -ms $(PREPROC) $(POSTPROC) $(REGISTERS) -Thtml $< > $@
+	sed -i '/<\/head>/i<link rel="stylesheet" href="s.css">' $@
 
 %.pdf: %.ms Makefile
 	REFER=ref.i groff -ms $(PREPROC) $(PDFOPT) -Tpdf $< > $@
diff --git a/garlic/doc/s.css b/garlic/doc/s.css
new file mode 100644
index 0000000..324f1ce
--- /dev/null
+++ b/garlic/doc/s.css
@@ -0,0 +1,19 @@
+html {
+	line-height: 1.6;
+	margin-bottom: 50px;
+	padding-bottom: 80px;
+}
+
+body {
+	max-width: 700px;
+	text-align: justify;
+	margin:0 auto;
+}
+
+pre {
+	overflow: auto;
+	display: block;
+	padding: 3px 3px;
+	line-height: 1.4;
+	background-color: #eeeeee;
+}