[Gtk-3.20] Tilix: Add bottom border for active titlebar. Fixes #657

Author: khurshid-alam

src/gtk-3.20/scss/apps/_gnome-terminal.scss

@@ -1,3 +1,5 @@
+@import "widgets/button";
+
 /**********************
  ! Genome Terminal *
 ***********************/
@@ -35,3 +37,16 @@
         }
     }
 }
+
+
+/**********************
+	! Tilix *
+***********************/
+
+@include exports("tilix") {
+    .terminal-titlebar:active {
+        border-width: 0 0 2px 0;
+        border-style: solid;
+        border-color: #d64937;
+    }
+}