diff --git a/source/css/_common/scaffolding/base.styl b/source/css/_common/scaffolding/base.styl
index b7578419b..abf962208 100644
--- a/source/css/_common/scaffolding/base.styl
+++ b/source/css/_common/scaffolding/base.styl
@@ -27,6 +27,7 @@ body {
   }
 
   if (hexo-config('body_scrollbar.stable')) {
+    // https://caniuse.com/mdn-css_properties_scrollbar-gutter
     scrollbar-gutter: stable;
   }
 }
diff --git a/source/css/_common/scaffolding/tags/tabs.styl b/source/css/_common/scaffolding/tags/tabs.styl
index f395c2400..bc7ea6721 100644
--- a/source/css/_common/scaffolding/tags/tabs.styl
+++ b/source/css/_common/scaffolding/tags/tabs.styl
@@ -11,7 +11,6 @@
     flex-wrap: wrap;
     margin: 0;
     padding: 0;
-    position: -webkit-sticky;
     position: sticky;
     top: 0;
     // Fix issue #398
diff --git a/source/css/_mixins.styl b/source/css/_mixins.styl
index 0ca778b61..e4dd275e2 100644
--- a/source/css/_mixins.styl
+++ b/source/css/_mixins.styl
@@ -71,8 +71,6 @@ word-wrap() {
 }
 
 disable-user-select() {
-  -moz-user-select: none;
-  -ms-user-select: none;
   -webkit-user-select: none;
   user-select: none;
 }
diff --git a/source/css/_schemes/Pisces/_sidebar.styl b/source/css/_schemes/Pisces/_sidebar.styl
index 2718905c7..2ca81359e 100644
--- a/source/css/_schemes/Pisces/_sidebar.styl
+++ b/source/css/_schemes/Pisces/_sidebar.styl
@@ -1,7 +1,6 @@
 +desktop() {
   .sidebar {
     // https://caniuse.com/css-sticky
-    position: -webkit-sticky;
     position: sticky;
     top: $sidebar-offset;
   }