diff --git a/css/css.go b/css/css.go
index 07712d1373..34ee87431d 100644
--- a/css/css.go
+++ b/css/css.go
@@ -81,14 +81,21 @@ func (t Token) String() string {
 	if len(t.Args) == 0 {
 		return t.TokenType.String() + "(" + string(t.Data) + ")"
 	}
-	return fmt.Sprint(t.Args)
+
+	sb := strings.Builder{}
+	sb.Write(t.Data)
+	for _, arg := range t.Args {
+		sb.WriteString(arg.String())
+	}
+	sb.WriteByte(')')
+	return sb.String()
 }
 
 // Equal returns true if both tokens are equal.
 func (t Token) Equal(t2 Token) bool {
 	if t.TokenType == t2.TokenType && bytes.Equal(t.Data, t2.Data) && len(t.Args) == len(t2.Args) {
 		for i := 0; i < len(t.Args); i++ {
-			if t.Args[i].TokenType != t2.Args[i].TokenType || !bytes.Equal(t.Args[i].Data, t2.Args[i].Data) {
+			if !t.Args[i].Equal(t2.Args[i]) {
 				return false
 			}
 		}
@@ -405,7 +412,7 @@ func (c *cssMinifier) minifyDeclaration(property []byte, components []css.Token)
 	}
 
 	values = c.minifyTokens(prop, 0, values)
-	if len(values) > 0 {
+	if 0 < len(values) {
 		values = c.minifyProperty(prop, values)
 	}
 	c.writeDeclaration(values, important)
diff --git a/css/css_test.go b/css/css_test.go
index f6e9336a9f..a29c5ca914 100644
--- a/css/css_test.go
+++ b/css/css_test.go
@@ -76,6 +76,7 @@ func TestCSS(t *testing.T) {
 
 		// bugs
 		{"a{@media screen and (min-width:1024px){ width: 40%; } & h1 { font-size: clamp(2.5rem, 1rem + 3vw, 3.5rem)}}", "a{@media screen and (min-width:1024px){width: 40%;}& h1 { font-size: clamp(2.5rem, 1rem + 3vw, 3.5rem)}}"}, // #602
+		{"a{padding:calc(var(--dce-edge-xsmall,6px) - 2px) calc(var(--dce-button-horizontal-padding,18px) - 2px)}", "a{padding:calc(var(--dce-edge-xsmall,6px) - 2px)calc(var(--dce-button-horizontal-padding,18px) - 2px)}"},       // #673
 	}
 
 	m := minify.New()
@@ -90,7 +91,7 @@ func TestCSS(t *testing.T) {
 
 	// coverage
 	test.T(t, Token{css.IdentToken, []byte("data"), nil, 0, 0}.String(), "Ident(data)")
-	test.T(t, Token{css.FunctionToken, nil, []Token{{css.IdentToken, []byte("data"), nil, 0, 0}}, 0, 0}.String(), "[Ident(data)]")
+	test.T(t, Token{css.FunctionToken, []byte("func("), []Token{{css.IdentToken, []byte("data"), nil, 0, 0}}, 0, 0}.String(), "func(Ident(data))")
 }
 
 func TestCSSInline(t *testing.T) {