diff --git a/addons/website/static/src/css/website.css b/addons/website/static/src/css/website.css
index 65e7aa4342a..32abb23c44d 100644
--- a/addons/website/static/src/css/website.css
+++ b/addons/website/static/src/css/website.css
@@ -91,10 +91,10 @@ font[style*='background'], font[class*='bg-'] {
 .o_ul_folded .o_ul_toggle_self:before, .o_ul_folded .o_ul_toggle_next:before {
   content: "";
 }
-.o_ul_folded .o_ul_toggle_self .o_open, .o_ul_folded .o_ul_toggle_next .o_open {
+.o_ul_folded .o_ul_toggle_self.o_open, .o_ul_folded .o_ul_toggle_next.o_open {
   left: 0em;
 }
-.o_ul_folded .o_ul_toggle_self .o_open:before, .o_ul_folded .o_ul_toggle_next .o_open:before {
+.o_ul_folded .o_ul_toggle_self.o_open:before, .o_ul_folded .o_ul_toggle_next.o_open:before {
   content: "";
 }
 
diff --git a/addons/website/static/src/css/website.sass b/addons/website/static/src/css/website.sass
index 97f6101a604..afaa0ded4f5 100644
--- a/addons/website/static/src/css/website.sass
+++ b/addons/website/static/src/css/website.sass
@@ -64,7 +64,7 @@ font[style*='background'], font[class*='bg-']
         text-decoration: none
         &:before
             content: "\f0da"
-        .o_open
+        &.o_open
             left: 0em
             &:before
                 content: "\f0d7"