Damn buttons.

Paper/gtk-3.0/widgets/buttons.css

@@ -101,7 +101,6 @@ GtkCalendar.button:backdrop:hover,
 /* Insensitive Button */
 .button:insensitive,
 .button.default:insensitive,
-.button:active:insensitive,
 .button.text-button:insensitive,
 .button.image-button:insensitive {
     border: 1px solid @insensitive_border;
@@ -112,7 +111,6 @@ GtkCalendar.button:backdrop:hover,
 /* Backdrop Button */
 .button:backdrop,
 .button.default:backdrop,
-.button:active:backdrop,
 .button.text-button:backdrop,
 .button.image-button:backdrop {
     border-color: @backdrop_button_background;
@@ -122,7 +120,6 @@ GtkCalendar.button:backdrop:hover,
 /* Backdrop Button */
 .button:backdrop:hover,
 .button.default:backdrop:hover,
-.button:active:backdrop:hover,
 .button.text-button:backdrop:hover,
 .button.image-button:backdrop:hover {
     background-color: shade(@backdrop_button_background, 1.1);
@@ -133,7 +130,6 @@ GtkCalendar.button:backdrop:hover,
 /* Insensitive Button */
 .button:insensitive:backdrop,
 .button.default:insensitive:backdrop,
-.button:active:insensitive:backdrop,
 .button.text-button:insensitive:backdrop,
 .button.image-button:insensitive:backdrop {
     border: 1px solid @insensitive_border;

Paper/gtk-3.0/widgets/header-bar.css

@@ -91,6 +91,7 @@
     background-color: transparent;
     border-radius: 0px;
     border: none;
+    outline: none;
     color: @header_text;
 }
 
@@ -106,6 +107,7 @@
     font: Bold;
     background-color: alpha(#000, 0.1);
     border: none;
+    outline: none;
     color: @header_text;
     box-shadow: inset 0 -2px 0 0 @header_text;
 }
@@ -122,6 +124,7 @@
     background-color: transparent;
     font: Bold;
     border: none;
+    outline: none;
     color: @header_text;
     box-shadow: inset 0 -2px 0 0 @header_text;
 }
@@ -137,6 +140,7 @@
     border-radius: 0px;
     background-color: alpha(#000, 0.1);
     border: none;
+    outline: none;
     box-shadow: inset 0 -2px 0 0 @header_text;
     color: @header_text;
 }
@@ -153,6 +157,7 @@
     border-radius: 0px;
     background-color: transparent;
     border: none;
+    outline: none;
     color: @backdrop_header_text;
 }
 
@@ -168,11 +173,12 @@
     font: Bold;
     background-color: transparent;
     border: none;
+    outline: none;
     color: @backdrop_header_text;
     box-shadow: inset 0 -2px 0 0 @backdrop_header_text;
 }
 
-/* Backdrop:Hover; Button */
+/* Backdrop:Hover Button */
 .header-bar .button:backdrop:hover,
 .header-bar .text-button:backdrop:hover,
 .header-bar .titlebutton:backdrop:hover,
@@ -183,6 +189,7 @@
     background-color: transparent;
     border-radius: 0px;
     border: none;
+    outline: none;
     box-shadow: inset 0 -2px 0 0 @backdrop_header_text;
     color: @backdrop_header_text;
 }
@@ -199,6 +206,23 @@
     border-radius: 0px;
     font: Bold;
     border: none;
+    outline: none;
+    color: @insensitive_header_text;
+}
+
+/* Insensitive:Backdrop Button */
+.header-bar .button:insensitive:backdrop,
+.header-bar .text-button:insensitive:backdrop,
+.header-bar .titlebutton:insensitive:backdrop,
+.header-bar .linked:insensitive:backdrop,
+.header-bar .flat:insensitive:backdrop,
+.header-bar .suggested-action .button:insensitive:backdrop,
+.header-bar .image-button:insensitive:backdrop {
+    border-radius: 0px;
+    font: Bold;
+    background-color: transparent;
+    border: none;
+    outline: none;
     color: @insensitive_header_text;
 }
 
@@ -288,6 +312,7 @@
     padding: 6px;
     border-radius: 6px;
     border: none;
+    outline: none;
     icon-shadow:none;
 }
 
@@ -296,12 +321,14 @@
     background: none;
     color: @header_text;
     border: none;
+    outline: none;
 }
 
 .header-bar .entry:backdrop {
     background: none;
     color: @backdrop_header_text;
     border: none;
+    outline: none;
 }
 
 .header-bar .entry.image {

Paper/gtk-3.0/widgets/titlebar.css

@@ -86,6 +86,7 @@
     background-color: transparent;
     border-radius: 0px;
     border: none;
+    outline: none;
     color: @header_text;
 }
 
@@ -101,6 +102,7 @@
     font: Bold;
     background-color: alpha(#000, 0.2);
     border: none;
+    outline: none;
     color: @header_text;
     box-shadow: inset 0 -4px 0 0 @header_text;
 }
@@ -117,6 +119,7 @@
     background-color: transparent;
     font: Bold;
     border: none;
+    outline: none;
     color: @header_text;
     box-shadow: inset 0 -2px 0 0 @header_text;
 }
@@ -132,6 +135,7 @@
     border-radius: 0px;
     background-color: alpha(#000, 0.1);
     border: none;
+    outline: none;
     box-shadow: inset 0 -2px 0 0 @header_text;
     color: @header_text;
 }
@@ -148,6 +152,7 @@
     border-radius: 0px;
     background-color: transparent;
     border: none;
+    outline: none;
     color: @backdrop_header_text;
 }
 
@@ -163,6 +168,7 @@
     font: Bold;
     background-color: transparent;
     border: none;
+    outline: none;
     color: @backdrop_header_text;
     box-shadow: inset 0 -2px 0 0 @backdrop_header_text;
 }
@@ -178,6 +184,7 @@
     background-color: transparent;
     border-radius: 0px;
     border: none;
+    outline: none;
     box-shadow: inset 0 -2px 0 0 @backdrop_header_text;
     color: @backdrop_header_text;
 }
@@ -194,10 +201,25 @@
     border-radius: 0px;
     font: Bold;
     border: none;
+    outline: none;
     color: @insensitive_header_text;
 }
 
-
+/* Insensitive:Backdrop Button */
+.titlebar .button:insensitive:backdrop,
+.titlebar .text-button:insensitive:backdrop,
+.titlebar .titlebutton:insensitive:backdrop,
+.titlebar .linked:insensitive:backdrop,
+.titlebar .flat:insensitive:backdrop,
+.titlebar .suggested-action .button:insensitive:backdrop,
+.titlebar .image-button:insensitive:backdrop {
+    border-radius: 0px;
+    font: Bold;
+    background-color: transparent;
+    border: none;
+    outline: none;
+    color: @insensitive_header_text;
+}
 
 /* Button Images */
 .titlebar .button GtkImage,
@@ -292,20 +314,24 @@
 .titlebar .right .button:first-child,
 .titlebar .right .titlebutton:first-child {
     border: none;
+    outline: none;
 }
 
 .titlebar .right .button:last-child,
 .titlebar .right .titlebutton:last-child {
     border: none;
+    outline: none;
 }
 
 .titlebar .left .button:last-child,
 .titlebar .left .titlebutton:last-child {
     border: none;
+    outline: none;
 }
 
 .titlebar .left .button:first-child,
 .titlebar .left .titlebutton:first-child {
     border: none;
+    outline: none;
 }