diff --git a/css/clean-code.css b/css/clean-code.css
index f88792a..c4d2955 100644
--- a/css/clean-code.css
+++ b/css/clean-code.css
@@ -127,3 +127,9 @@ a {
         border-radius: 0;
     }
 }
+
+/* Testing some sass properties */
+
+a:hover {
+    color: color.adjust($color-hl, $lightness: -20%);
+}
diff --git a/css/dirty-code.css b/css/dirty-code.css
index 4d8a5e7..ba4996e 100644
--- a/css/dirty-code.css
+++ b/css/dirty-code.css
@@ -82,3 +82,6 @@ justify-content: center;   // 3. this comment is not removed
 
 /* Is @media working ? */
 @media(max-width:768px) {body {border-radius:    0px}}
+
+/* Testing some sass properties */
+a:hover{color: color.adjust($color-hl, $lightness: -20%)}
diff --git a/inc/classes/csslisible.class.php b/inc/classes/csslisible.class.php
index 33209d6..00849b5 100644
--- a/inc/classes/csslisible.class.php
+++ b/inc/classes/csslisible.class.php
@@ -35,6 +35,10 @@ class CSSLisible {
             'regex' => '#((translate|rgba|calc)\((.+)\))#U',
             'list' => array()
         ),
+        'color_include' => array(
+            'regex' => '#(color\.adjust\([^\)]*\))#U',
+            'list' => array()
+        ),
         'url_data_etc' => array(
             'regex' => '#url\((.*)\)#U',
             'list' => array()