diff --git a/css/style-alphabetnavigation.css b/css/style-alphabetnavigation.css
index 61fb53820..6c416166d 100644
--- a/css/style-alphabetnavigation.css
+++ b/css/style-alphabetnavigation.css
@@ -5,7 +5,7 @@
  * later. See the COPYING file.
  *
  * @author Pauli Järvinen <pauli.jarvinen@gmail.com>
- * @copyright Pauli Järvinen 2018
+ * @copyright Pauli Järvinen 2018 - 2020
  */
 
 .alphabet-navigation {
@@ -20,8 +20,6 @@
 .alphabet-navigation a {
 	display: block;
 	font-weight: bold;
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=10)";
-	filter: alpha(opacity = 10);
 	opacity: .1;
 }
 
@@ -31,8 +29,6 @@
 
 .alphabet-navigation a.available {
 	display: block;
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=40)";
-	filter: alpha(opacity = 40);
 	opacity: .4;
 }
 
@@ -41,8 +37,6 @@
 }
 
 .alphabet-navigation a.available:hover {
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=80)";
-	filter: alpha(opacity = 80);
 	opacity: .8;
 }
 
diff --git a/css/style-controls.css b/css/style-controls.css
index cade08377..1ab77a62b 100644
--- a/css/style-controls.css
+++ b/css/style-controls.css
@@ -7,7 +7,7 @@
  * @author Morris Jobke <hey@morrisjobke.de>
  * @author Pauli Järvinen <pauli.jarvinen@gmail.com>
  * @copyright Morris Jobke 2013, 2014
- * @copyright Pauli Järvinen 2017, 2018
+ * @copyright Pauli Järvinen 2017 - 2020
  */
 
 #controls {
@@ -51,10 +51,6 @@ body:not(.snapjs-left) #controls.taller-header {
 	padding: 10px;
 	margin: 9px 2px 5px;
 	cursor: pointer;
-
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=40)";
-	filter: alpha(opacity = 40);
 	opacity: .4;
 }
 
@@ -70,9 +66,6 @@ body:not(.snapjs-left) #controls.taller-header {
 }
 
 #controls .control:hover, #controls .control:focus {
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
-	filter: alpha(opacity = 100);
 	opacity: 1;
 }
 
@@ -144,8 +137,6 @@ body:not(.snapjs-left) #controls.taller-header {
 }
 
 #controls .buffer-bar {
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=10)";
-	filter: alpha(opacity = 10);
 	opacity: 0.1;
 }
 
@@ -161,8 +152,6 @@ body:not(.snapjs-left) #controls.taller-header {
 
 .control.toggle.active,
 .control.toggle:hover {
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
-	filter: alpha(opacity = 100);
 	opacity: 1;
 }
 
@@ -177,8 +166,6 @@ body:not(.snapjs-left) #controls.taller-header {
 
 #controls #volume-icon {
 	cursor: default;
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=40)";
-	filter: alpha(opacity = 40);
 	opacity: .4;
 	position: absolute;
 	top: 0;
diff --git a/css/style-navigation.css b/css/style-navigation.css
index a3b7d46aa..09db5a90f 100644
--- a/css/style-navigation.css
+++ b/css/style-navigation.css
@@ -7,7 +7,7 @@
  * @author Morris Jobke <hey@morrisjobke.de>
  * @author Pauli Järvinen <pauli.jarvinen@gmail.com>
  * @copyright Morris Jobke 2013, 2014
- * @copyright Pauli Järvinen 2016 - 2018
+ * @copyright Pauli Järvinen 2016 - 2020
  */
 
 #app-navigation {
@@ -92,11 +92,7 @@
 }
 
 #app-navigation button.disabled {
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
-	filter: alpha(opacity = 50);
 	opacity: .5;
-
 	pointer-events: none;
 }
 
diff --git a/css/style-playlist.css b/css/style-playlist.css
index 6a7cc53b4..bf42b655a 100644
--- a/css/style-playlist.css
+++ b/css/style-playlist.css
@@ -79,17 +79,10 @@
 	background-color: transparent;
 	vertical-align: middle;
 	margin: 0;
-
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
-	filter: alpha(opacity=50);
 	opacity: 0.5;
 }
 
 .playlist-area .track-list li .action:hover {
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
-	filter: alpha(opacity=100);
 	opacity: 1;
 }
 
diff --git a/css/style-settings.css b/css/style-settings.css
index 6a8213769..2dcc61d6a 100644
--- a/css/style-settings.css
+++ b/css/style-settings.css
@@ -67,14 +67,10 @@
 #music-user .clipboardButton {
 	background-size: 16px 16px;
 	padding: 16px;
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
-	filter: alpha(opacity=50);
 	opacity: .5;
 }
 
 #music-user .clipboardButton:hover {
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
-	filter: alpha(opacity=100);
 	opacity: 1;
 }
 
@@ -106,8 +102,6 @@
 
 #music-user table td.key-action a {
 	padding: 10px 16px;
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
-	filter: alpha(opacity=50);
 	opacity: .5;
 }
 
diff --git a/css/style-sidebar.css b/css/style-sidebar.css
index 5c318c70c..b96689ddf 100644
--- a/css/style-sidebar.css
+++ b/css/style-sidebar.css
@@ -29,16 +29,12 @@
 	width: 44px;
 	height: 44px;
 	opacity: 0.5;
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
-	filter: alpha(opacity=50);
 	z-index: 1;
 	background-color: #ffffffcc;
 }
 
 #app-sidebar .close:hover {
 	opacity: 1;
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
-	filter: alpha(opacity=100);
 }
 
 #app-sidebar .albumart {
@@ -54,8 +50,6 @@
 	vertical-align: middle;
 	text-align: center;
 	opacity: 0.4;
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=40)";
-	filter: alpha(opacity=40);
 }
 
 #app-sidebar #path {
@@ -85,10 +79,6 @@
 	overflow: hidden;
 	text-overflow: ellipsis;
 	text-align: right;
-
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
-	filter: alpha(opacity = 50);
 	opacity: .5;
 }
 
@@ -161,8 +151,6 @@
 	text-align: center;
 	margin-top: 40px;
 	opacity: 0.4;
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=40)";
-	filter: alpha(opacity=40);
 }
 
 #app-sidebar #lastfm-info p {
diff --git a/css/style.css b/css/style.css
index ca121d6e9..0bdf62c6c 100644
--- a/css/style.css
+++ b/css/style.css
@@ -58,9 +58,6 @@ body#body-user.dark {
 .play {
 	display: inline;
 	visibility: hidden;
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=70)";
-	filter: alpha(opacity = 70);
 	opacity: .7;
 	height: 10px;
 }
@@ -157,17 +154,10 @@ h1 span:hover .play {
 	background-size: 100% 100%;
 	background-position: center;
 	background-repeat: no-repeat;
-
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=60)";
-	filter: alpha(opacity = 60);
 	opacity: .6;
 }
 
 #app-view :hover > .play-pause {
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
-	filter: alpha(opacity = 100);
 	opacity: 1.0;
 }
 
@@ -189,10 +179,6 @@ div:hover > .play-pause,
 	border: none;
 	background-color: transparent;
 	visibility: hidden;
-
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
-	filter: alpha(opacity=50);
 	opacity: 0.5;
 }
 
@@ -201,16 +187,10 @@ div:hover > .play-pause,
 }
 
 #app-view .icon-details:hover {
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
-	filter: alpha(opacity=100);
 	opacity: 1;
 }
 
 .muted {
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
-	filter: alpha(opacity = 50);
 	opacity: .5;
 	display: inline;
 }
@@ -247,9 +227,6 @@ div:hover > .play-pause,
 #toScan:hover *,
 #toRescan:hover * {
 	color: #000;
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
-	filter: alpha(opacity = 100);
 	opacity: 1;
 }
 
@@ -261,17 +238,10 @@ div:hover > .play-pause,
 	bottom: 0;
 	z-index: 101;
 	background-color: rgba(255,255,255,0.5);
-
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=40)";
-	filter: alpha(opacity = 40);
 	opacity: .4;
 }
 
 #updateData:hover, #updateData:focus {
-	/* opacity */
-	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
-	filter: alpha(opacity = 100);
 	opacity: 1;
 }