Remove obsolete CSS

static/css/bootstrap.css

@@ -2318,7 +2318,6 @@ select[multiple].input-lg {
 fieldset[disabled] .btn {
   cursor: not-allowed;
   opacity: 0.65;
-  filter: alpha(opacity=65);
   -webkit-box-shadow: none;
   box-shadow: none;
 }
@@ -2848,7 +2847,6 @@ tbody.collapse.in {
   text-decoration: none;
   background-color: transparent;
   background-image: none;
-  filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
   cursor: not-allowed;
 }
 .open > .dropdown-menu {
@@ -4756,7 +4754,6 @@ button.list-group-item-danger.active:focus {
   color: var(--close-color);
   text-shadow: 0 1px 0 #fff;
   opacity: 0.2;
-  filter: alpha(opacity=20);
 }
 .close:hover,
 .close:focus {
@@ -4764,7 +4761,6 @@ button.list-group-item-danger.active:focus {
   text-decoration: none;
   cursor: pointer;
   opacity: 0.5;
-  filter: alpha(opacity=50);
 }
 button.close {
   padding: 0;
@@ -4835,11 +4831,9 @@ button.close {
 }
 .modal-backdrop.fade {
   opacity: 0;
-  filter: alpha(opacity=0);
 }
 .modal-backdrop.in {
   opacity: 0.5;
-  filter: alpha(opacity=50);
 }
 .modal-header {
   padding: 15px;
@@ -4917,11 +4911,9 @@ button.close {
   word-wrap: normal;
   font-size: 12px;
   opacity: 0;
-  filter: alpha(opacity=0);
 }
 .tooltip.in {
   opacity: 0.9;
-  filter: alpha(opacity=90);
 }
 .tooltip.top {
   margin-top: -3px;
@@ -5093,9 +5085,6 @@ button.close {
 .affix {
   position: fixed;
 }
-@-ms-viewport {
-  width: device-width;
-}
 .visible-xs,
 .visible-sm,
 .visible-md,

static/css/selectize.hc.css

@@ -45,7 +45,6 @@
   -webkit-box-shadow: none;
   box-shadow: none;
   -webkit-border-radius: 2px;
-  -moz-border-radius: 2px;
   border-radius: 2px;
 }
 .selectize-control.multi .selectize-input.has-items {
@@ -64,7 +63,6 @@
 }
 .selectize-input.dropdown-active {
   -webkit-border-radius: 2px 2px 0 0;
-  -moz-border-radius: 2px 2px 0 0;
   border-radius: 2px 2px 0 0;
 }
 .selectize-input > * {
@@ -135,7 +133,6 @@
   -webkit-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
   box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
   -webkit-border-radius: 0 0 2px 2px;
-  -moz-border-radius: 0 0 2px 2px;
   border-radius: 0 0 2px 2px;
 }
 .selectize-dropdown [data-selectable] {
@@ -145,7 +142,6 @@
 .selectize-dropdown [data-selectable] .highlight {
   background: rgba(255, 237, 40, 0.4);
   -webkit-border-radius: 1px;
-  -moz-border-radius: 1px;
   border-radius: 1px;
 }
 .selectize-dropdown .option,
@@ -232,7 +228,6 @@
   border: 1px solid #ccc;
   border: 1px solid rgba(0, 0, 0, 0.15);
   -webkit-border-radius: 2px;
-  -moz-border-radius: 2px;
   border-radius: 2px;
   -webkit-box-shadow: 0 6px 12px rgba(0, 0, 0, 0.175);
   box-shadow: 0 6px 12px rgba(0, 0, 0, 0.175);
@@ -265,7 +260,6 @@
 }
 .selectize-input.dropdown-active {
   -webkit-border-radius: 2px;
-  -moz-border-radius: 2px;
   border-radius: 2px;
 }
 .selectize-input.dropdown-active::before {
@@ -293,7 +287,6 @@
 }
 .selectize-control.multi .selectize-input > div {
   -webkit-border-radius: 1px;
-  -moz-border-radius: 1px;
   border-radius: 1px;
 }
 .form-control.selectize-control {
@@ -304,6 +297,5 @@
   -webkit-box-shadow: none;
   box-shadow: none;
   -webkit-border-radius: 0;
-  -moz-border-radius: 0;
   border-radius: 0;
 }

stuff/bootstrap/dropdowns.less

@@ -112,7 +112,6 @@
     text-decoration: none;
     background-color: transparent;
     background-image: none; // Remove CSS gradient
-    .reset-filter();
     cursor: @cursor-disabled;
   }
 }

stuff/bootstrap/mixins.less

@@ -6,7 +6,6 @@
 @import "mixins/opacity.less";
 @import "mixins/image.less";
 @import "mixins/labels.less";
-@import "mixins/reset-filter.less";
 @import "mixins/resize.less";
 @import "mixins/responsive-visibility.less";
 @import "mixins/size.less";

stuff/bootstrap/mixins/opacity.less

@@ -2,7 +2,4 @@
 
 .opacity(@opacity) {
   opacity: @opacity;
-  // IE8 filter
-  @opacity-ie: (@opacity * 100);
-  filter: ~"alpha(opacity=@{opacity-ie})";
 }

stuff/bootstrap/mixins/reset-filter.less

@@ -1,8 +0,0 @@
-// Reset filters for IE
-//
-// When you need to remove a gradient background, do not forget to use this to reset
-// the IE filter for IE9 and below.
-
-.reset-filter() {
-  filter: e(%("progid:DXImageTransform.Microsoft.gradient(enabled = false)"));
-}

stuff/bootstrap/responsive-utilities.less

@@ -2,27 +2,6 @@
 // Responsive: Utility classes
 // --------------------------------------------------
 
-
-// IE10 in Windows (Phone) 8
-//
-// Support for responsive views via media queries is kind of borked in IE10, for
-// Surface/desktop in split view and for Windows Phone 8. This particular fix
-// must be accompanied by a snippet of JavaScript to sniff the user agent and
-// apply some conditional CSS to *only* the Surface/desktop Windows 8. Look at
-// our Getting Started page for more information on this bug.
-//
-// For more information, see the following:
-//
-// Issue: https://github.com/twbs/bootstrap/issues/10497
-// Docs: http://getbootstrap.com/getting-started/#support-ie10-width
-// Source: http://timkadlec.com/2013/01/windows-phone-8-and-device-width/
-// Source: http://timkadlec.com/2012/10/ie10-snap-mode-and-responsive-design/
-
-@-ms-viewport {
-  width: device-width;
-}
-
-
 // Visibility utilities
 // Note: Deprecated .visible-xs, .visible-sm, .visible-md, and .visible-lg as of v3.2.0
 .visible-xs,

stuff/selectize/selectize.less

@@ -58,7 +58,6 @@
 
 .selectize-border-radius (@radii) {
 	-webkit-border-radius: @radii;
-	-moz-border-radius: @radii;
 	border-radius: @radii;
 }
 .selectize-unselectable () {