diff --git a/src/_h5ai/client/css/inc/bottombar.less b/src/_h5ai/client/css/inc/bottombar.less
index 8603e04f..53ca8340 100644
--- a/src/_h5ai/client/css/inc/bottombar.less
+++ b/src/_h5ai/client/css/inc/bottombar.less
@@ -7,10 +7,8 @@
 	left: 0;
 	bottom: 0;
 	padding: 6px 0 8px 0;
-	// .vert-gradient(rgb(241,241,241), rgb(228,228,228));
 	background-color: @col-widget-back;
 	border-top: @border-widget;
-	// .box-shadow(0 -2px 4px 0 rgba(0, 0, 0, 0.15);
 
 	color: #999;
 	text-align: center;
diff --git a/src/_h5ai/client/css/inc/dropbox.less b/src/_h5ai/client/css/inc/dropbox.less
index 785dc2b6..ed8dfefa 100644
--- a/src/_h5ai/client/css/inc/dropbox.less
+++ b/src/_h5ai/client/css/inc/dropbox.less
@@ -1,7 +1,7 @@
 
 #content {
 	border: 1px dashed #fff;
-	.border-radius(8px);
+	border-radius: 8px;
 	.transition(border-color 0.2s ease-in-out);
 
 	&.hint {
diff --git a/src/_h5ai/client/css/inc/general.less b/src/_h5ai/client/css/inc/general.less
index 8d2e140a..aa80c092 100644
--- a/src/_h5ai/client/css/inc/general.less
+++ b/src/_h5ai/client/css/inc/general.less
@@ -16,9 +16,6 @@
 @col-widget-back-sel: rgba(255,255,255,0.8);
 @col-widget-sep: @col-border;
 
-// @col-sb-back: rgb(210,210,210);
-// @col-sb-thumb: rgb(180,180,180);
-// @col-sb-thumb-active: rgb(150,150,150);
 @col-sb-back: rgba(0,0,0,0.08);
 @col-sb-thumb: rgba(0,0,0,0.15);
 @col-sb-thumb-active: rgba(0,0,0,0.25);
@@ -38,7 +35,6 @@ html { overflow-y: auto; }
 
 body {
 	font-family: @font-family;
-	// font-weight: 400;
 	font-size: 13px;
 	color: @col;
 	background-color: @col-back;
diff --git a/src/_h5ai/client/css/inc/h5ai-info.less b/src/_h5ai/client/css/inc/h5ai-info.less
index f662d64e..d231be17 100644
--- a/src/_h5ai/client/css/inc/h5ai-info.less
+++ b/src/_h5ai/client/css/inc/h5ai-info.less
@@ -36,7 +36,7 @@ body#h5ai-info {
 	code {
 		margin: 0 0.2em;
 		padding: 2px 4px;
-		.border-radius(4px);
+		border-radius: 4px;
 		font-family: @font-family-mono;
 		letter-spacing: 0.1em;
 		background-color: @col-widget-back;
diff --git a/src/_h5ai/client/css/inc/notify.less b/src/_h5ai/client/css/inc/notify.less
index 4ac6545e..8c1b7867 100644
--- a/src/_h5ai/client/css/inc/notify.less
+++ b/src/_h5ai/client/css/inc/notify.less
@@ -9,6 +9,6 @@
 	padding: 2px 6px 2px 6px;
 	color: #fff;
 	background-color: rgba(0, 0, 0, 0.2);
-	.border-radius(4px);
+	border-radius: 4px;
 	text-align: center;
 }
diff --git a/src/_h5ai/client/css/inc/preview-img.less b/src/_h5ai/client/css/inc/preview-img.less
index a4542c22..ce69d923 100644
--- a/src/_h5ai/client/css/inc/preview-img.less
+++ b/src/_h5ai/client/css/inc/preview-img.less
@@ -24,7 +24,7 @@
 	max-width: 100%;
 	max-height: 100%;
 	border: 2px solid #fff;
-	.border-radius(4px);
+	border-radius: 4px;
 
 	background-color: @check-white;
 	background-image:
@@ -39,7 +39,7 @@
 
 	#pv-img-image {
 		border: 0;
-		.border-radius(0);
+		border-radius: 0;
 	}
 }
 
@@ -124,7 +124,6 @@
 	height: 32px;
 	left: 0;
 	bottom: 0;
-	// .vert-gradient(rgb(27,27,27), rgb(14,14,14));
 	background-color: rgb(27,27,27);
 	border-top: 1px solid rgb(45,45,45);
 }
diff --git a/src/_h5ai/client/css/inc/preview-txt.less b/src/_h5ai/client/css/inc/preview-txt.less
index bbbb893a..a236ff0a 100644
--- a/src/_h5ai/client/css/inc/preview-txt.less
+++ b/src/_h5ai/client/css/inc/preview-txt.less
@@ -19,7 +19,7 @@
 	padding: 10px;
 	background-color: #fff;
 	border: 2px solid #fff;
-	.border-radius(4px);
+	border-radius: 4px;
 	text-align: left;
 	overflow: auto;
 	position: relative;
@@ -227,6 +227,6 @@
 	height: 32px;
 	left: 0;
 	bottom: 0;
-	.vert-gradient(rgb(27,27,27), rgb(14,14,14));
+	background-color: rgb(27,27,27);
 	border-top: 1px solid rgb(45,45,45);
 }
diff --git a/src/_h5ai/client/css/inc/topbar.less b/src/_h5ai/client/css/inc/topbar.less
index 04b52559..e0da03c6 100644
--- a/src/_h5ai/client/css/inc/topbar.less
+++ b/src/_h5ai/client/css/inc/topbar.less
@@ -6,10 +6,8 @@
 	min-height: 30px;
 	left: 0;
 	top: 0;
-	// .vert-gradient(rgb(241,241,241), rgb(228,228,228));
 	background-color: @col-widget-back;
 	border-bottom: @border-widget;
-	// .box-shadow(0 2px 4px 0 rgba(0, 0, 0, 0.15);
 }
 
 
diff --git a/src/_h5ai/client/css/inc/tree.less b/src/_h5ai/client/css/inc/tree.less
index 2f258b6f..be456672 100644
--- a/src/_h5ai/client/css/inc/tree.less
+++ b/src/_h5ai/client/css/inc/tree.less
@@ -12,15 +12,12 @@
 	border-right: @border-widget;
 
 	.sp-scrollbar {
-		// margin: 8px 8px 8px 0;
 		width: 6px;
 		background-color: @col-sb-back;
-		// .border-radius(3px);
 		cursor: pointer;
 
 		.sp-thumb {
 			background-color: @col-sb-thumb;
-			// .border-radius(3px);
 		}
 		&.active .sp-thumb {
 			background-color: @col-sb-thumb-active;
@@ -63,14 +60,13 @@
 		padding: 4px 6px;
 		color: #555;
 		border: 1px solid rgba(0,0,0,0);
-		.border-radius(3px);
+		border-radius: 3px;
 		text-decoration: none;
 		opacity: 0.7;
 
 		&:hover, &.hover {
 			color: @col-hover;
 			background-color: @col-widget-back-hover;
-			// border-color: rgba(0,0,0,0.05);
 			opacity: 1;
 		}
 	}
diff --git a/src/_h5ai/client/css/inc/view.less b/src/_h5ai/client/css/inc/view.less
index f75c44c7..14103a72 100644
--- a/src/_h5ai/client/css/inc/view.less
+++ b/src/_h5ai/client/css/inc/view.less
@@ -76,7 +76,6 @@
 				overflow: hidden;
 
 				&:hover, &.hover {
-					// color: #e80;
 					color: @col-hover;
 					background-color: @item-background-col-hover;
 					border-color: @item-border-col-hover;
@@ -86,8 +85,6 @@
 			&.selected:not(.selecting), &.selecting:not(.selected) {
 
 				a, a:active, a:visited {
-					// color: #000;
-					// color: @col-hover;
 					background-color: @item-background-col-sel;
 					border-color: @item-border-col-sel;
 
@@ -105,7 +102,6 @@
 				color: #aaa;
 
 				&:hover, &.hover {
-					// color: #e80;
 					color: @col-hover;
 				}
 			}
@@ -131,7 +127,7 @@
 			img {
 
 				&.thumb {
-					.box-shadow(0 0 0 1px #ddd);
+					box-shadow: 0 0 0 1px #ddd;
 				}
 			}
 
diff --git a/src/_h5ai/client/css/lib/mixins.less b/src/_h5ai/client/css/lib/mixins.less
index e1ecd862..82978299 100644
--- a/src/_h5ai/client/css/lib/mixins.less
+++ b/src/_h5ai/client/css/lib/mixins.less
@@ -1,57 +1,12 @@
 
-.border-radius (@radius) {
-    -webkit-border-radius: @radius; /* Saf3-4, iOS 1-3.2, Android <1.6 */
-       -moz-border-radius: @radius; /* FF1-3.6 */
-            border-radius: @radius; /* Opera 10.5, IE9, Saf5, Chrome, FF4, iOS 4, Android 2.1+ */
-}
-
-
-.background-clip () {
-    -webkit-background-clip: padding-box;
-       -moz-background-clip: padding;
-            background-clip: padding-box;
-}
-
-
-.box-shadow (@shadow) {
-    -webkit-box-shadow: @shadow; /* Saf3-4 */
-       -moz-box-shadow: @shadow; /* FF3.5 - 3.6 */
-            box-shadow: @shadow; /* Opera 10.5, IE9, FF4+, Chrome 10+ */
-}
-
-
 .transition (@transition) {
-    -webkit-transition: @transition; /* Saf3.2+, Chrome */
-       -moz-transition: @transition; /* FF4+ */
-        -ms-transition: @transition; /* IE10? */
-         -o-transition: @transition; /* Opera 10.5+ */
-            transition: @transition;
+	-webkit-transition: @transition;
+	transition: @transition;
 }
 
-
 .transform (@transform) {
-    -webkit-transform: @transform; /* Saf3.1+, Chrome */
-       -moz-transform: @transform; /* FF3.5+ */
-        -ms-transform: @transform; /* IE9 */
-         -o-transform: @transform; /* Opera 10.5 */
-            transform: @transform;
-                 zoom: 1;
-}
-
-
-.vert-gradient (@top, @bottom) {
-    background-color: @top;
-    background-image: -webkit-gradient(linear, left top, left bottom, from(@top), to(@bottom)); /* Saf4+, Chrome */
-    background-image: -webkit-linear-gradient(top, @top, @bottom); /* Chrome 10+, Saf5.1+, iOS 5+ */
-    background-image:    -moz-linear-gradient(top, @top, @bottom); /* FF3.6 */
-    background-image:     -ms-linear-gradient(top, @top, @bottom); /* IE10 */
-    background-image:      -o-linear-gradient(top, @top, @bottom); /* Opera 11.10+ */
-    background-image:         linear-gradient(top, @top, @bottom);
-}
-
-
-.background-size (@size) {
-    -webkit-background-size: @size; /* Saf3-4 */
-       -moz-background-size: @size; /* FF3.6 */
-            background-size: @size; /* Opera, IE9, Saf5, Chrome, FF4 */
+	-webkit-transform: @transform;
+	-ms-transform: @transform;
+	transform: @transform;
+	zoom: 1;
 }