Mainly refined column headers.

Paper/gtk-3.0/widgets/buttons.css

@@ -133,6 +133,7 @@ GtkCalendar.button:backdrop:hover,
     background-image: none;
     color: @backdrop_text;
 }
+
 /* Backdrop Button */
 .button:backdrop:hover,
 .button.default:backdrop:hover,

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

@@ -16,30 +16,111 @@
 * with the Paper GTK theme. If not, see http://www.gnu.org/licenses/.
 */
 
-/*****************
+/******************
- * Column header *
+ * Column Headers *
  *****************/
 
+column-header .button,
+.content-view column-header .button {
+    border-radius: 0;
+    border-width: 0px;
+}
+
+column-header .button GtkImage,
+column-header .button GtkLabel {
+    padding-left: 3px;
+    color: @text;
+}
+
+column-header:nth-child(first) .button,
+column-header:nth-child(first) .button:active,
+column-header:nth-child(first) .button:backdrop,
+column-header:nth-child(first) .button:backdrop:hover,
+.content-view column-header:nth-child(first) .button {
+    border-width: 0 0 1px 0;
+}
+
+/* Normal */
 column-header .button {
-    background: none;
+    background-image: linear-gradient(to bottom, 
-	box-shadow: none;
+                                      @button_background,
-    border-radius: 0px;
+                                      shade(@button_background, 0.98)
-    border: solid @border;
+                                      );
+    border-image: linear-gradient(to bottom,
+                                      @button_border,
+                                      shade(@button_border, 0.98)
+                                  ) 0 0 1 1;
     border-width: 0 0 1px 1px;
+    padding: 4px 2px 4px 2px;
+    color: @text;
 }
 
-column-header:first-child .button,
+/* Active */
-column-header .button:first-child {
+column-header .button:focus,
-    border-radius: 0px;
+column-header .button:active {
-    border: solid @border;
+    background-image: linear-gradient(to bottom, 
+                                      @button_background,
+                                      shade(@button_background, 0.98)
+                                      );
+    border-image: linear-gradient(to bottom,
+                                      @button_border,
+                                      shade(@button_border, 0.98)
+                                  ) 0 0 1 1;
     border-width: 0 0 1px 1px;
+    padding: 4px 2px 4px 2px;
+    color: @text;
 }
 
-column-header:last-child .button,
+column-header .button:focus GtkImage,
-column-header .button:last-child {
+column-header .button:focus GtkLabel,
-    border-radius: 0px;
+column-header .button:active GtkImage,
-    border: solid @border;
+column-header .button:active GtkLabel {
-    border-width: 0 0 1px 1px;
+    color: @text;
 }
 
+/* Backdrop */
+column-header .button:backdrop {
+    background-image: none;
+    background-color: @backdrop_background;
+    border-image: none;
+    border-color: @backdrop_border;
+    border-width: 0 0 1px 1px;
+    padding: 4px 2px 4px 2px;
+    color: @backdrop_text;
+}
 
+column-header .button:backdrop GtkImage,
+column-header .button:backdrop GtkLabel {
+    color: @backdrop_text;
+}
+
+/* Hover */
+column-header .button:hover {
+    background-image: linear-gradient(to bottom, 
+                                      shade(@button_background, 1.2),
+                                      shade(shade(@button_background, 1.2), 0.98)
+                                      );
+    padding: 4px 2px 4px 2px;
+    border-width: 0 0 1px 1px;
+    color: @text;
+}
+
+column-header .button:hover GtkImage,
+column-header .button:hover GtkLabel {
+    color: @text;
+}
+
+/* Hover:Backdrop; */
+column-header .button:hover:backdrop {
+    background-image: linear-gradient(to bottom, 
+                                      shade(@backdrop_button_background, 1.1),
+                                      shade(shade(@backdrop_button_background, 1.1), 0.98)
+                                      );
+    border-width: 0 0 1px 1px;
+    color: @backdrop_text;
+}
+
+column-header .button:hover:backdrop GtkImage,
+column-header .button:hover:backdrop GtkLabel {
+    color: @backdrop_text;
+}

Paper/gtk-3.0/widgets/dynamic-notebook.css

@@ -49,7 +49,7 @@
 
 
 .dynamic-notebook .notebook {
-    -GtkNotebook-tab-overlap: 1px;
+    /*-GtkNotebook-tab-overlap: 1px;*/
     border-width: 0;
 }
 

Paper/gtk-3.0/widgets/message-dialogs.css

@@ -44,8 +44,8 @@
 
 .message-dialog .titlebar {
     padding: 0px;
-    border-top-left-radius: 6px;
+    border-top-left-radius: 0px;
-    border-top-right-radius: 6px;
+    border-top-right-radius: 0px;
     border: none;
     background-color: @background;
     color: @text;