Added styling for action bar

gtk-3.0/gtk-widgets.css

@@ -2751,6 +2751,37 @@ GtkViewport.frame {
     color: @theme_selected_fg_color;
 }
 
+/**************
+ * action-bar *
+ **************/
+.action-bar {
+    padding: 4px;
+    border-width: 1px 0 0;
+    border-style: solid;
+    border-color: shade(@theme_bg_color, 0.8);
+    background-color: @theme_bg_color;
+    background-image: none;
+    color: @theme_bg_color;
+}
+
+.action-bar .button.text-button {
+    padding: 4px;
+}
+
+.action-bar .button.image-button {
+    padding: 6px;
+}
+
+.action-bar .title {
+    font: bold;
+    padding: 0 12px;
+}
+
+.action-bar .subtitle {
+    font: smaller;
+    padding: 0 12px;
+}
+
 /***************
  * search bars *
  ***************/