1diff --git a/main.go b/main.go
 2index 7c4e9a4..1b5cb2b 100644
 3--- a/main.go
 4+++ b/main.go
 5@@ -51,7 +51,7 @@ type TrackedFile struct {
 6 }
 7 
 8 func (f *TrackedFile) SaveTemplate(t *template.Template) {
 9-	lexer := lexers.Match(f.Destination)
10+	lexer := lexers.Match(f.DestinationDir)
11 	if lexer == nil {
12 		lexer = lexers.Fallback
13 	}
14@@ -65,7 +65,11 @@ func (f *TrackedFile) SaveTemplate(t *template.Template) {
15 	checkErr(err)
16 	fileStr := string(fileBytes)
17 	iterator, err := lexer.Tokenise(nil, fileStr)
18-	formatter := html.New(html.WithClasses(true))
19+	formatter := html.New(
20+		html.WithClasses(true),
21+		html.WithLineNumbers(true),
22+		html.LinkableLineNumbers(true, ""),
23+	)
24 	s := ""
25 	buf := bytes.NewBufferString(s)
26 	err = formatter.Format(buf, style, iterator)
27diff --git a/styles.css b/styles.css
28index 20d7994..2cfa342 100644
29--- a/styles.css
30+++ b/styles.css
31@@ -13,6 +13,7 @@
32   --font-size: 13px;
33   --font-family: var(--sans-font);
34   /* Dark/light theme variables. */
35+  --bg: white;
36   --text-color: black;
37   --second-text-color: #838181;
38   --link-color: var(--blue);