feat: use tailwind css

pkg/invoice/report/template.go

@@ -15,9 +15,13 @@ var htmlTemplate string
 //go:embed assets/style.css
 var style template.CSS
 
+//go:embed assets/tailwind.js
+var tailwind template.JS
+
 type tmpler struct {
 	Report
-	Style template.CSS
+	Tailwind template.JS
+	Style    template.CSS
 }
 
 func (r Report) ToHTML() (html string, err error) {
@@ -33,7 +37,7 @@ func (r Report) ToHTML() (html string, err error) {
 
 	buf := new(bytes.Buffer)
 
-	err = tmpl.Execute(buf, tmpler{r, style})
+	err = tmpl.Execute(buf, tmpler{r, tailwind, style})
 	if err != nil {
 		return html, err
 	}