[gnome-builder] style: adjust styling for dark theme

[Christian Hergert <chergert src gnome org>]

commit 4fdb3f7b0b45329373b04384fc2b10b20a1b4334
Author: Christian Hergert <christian hergert me>
Date:   Mon Dec 14 15:55:43 2015 -0800

    style: adjust styling for dark theme

 data/theme/Adwaita-dark.css |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/data/theme/Adwaita-dark.css b/data/theme/Adwaita-dark.css
index e793f82..477a96e 100644
--- a/data/theme/Adwaita-dark.css
+++ b/data/theme/Adwaita-dark.css
@@ -161,10 +161,6 @@ layouttab label {
   text-shadow: 0 1px #101010;
 }
 
-layouttab label:hover {
-  color: black;
-}
-
 layouttab label:backdrop {
   text-shadow: none;
 }
@@ -245,11 +241,16 @@ layoutpane > box > box:first-child > stackswitcher > button {
   background-color: transparent;
   border-style: none;
   border-radius: 0px;
+  border-bottom: 3px solid transparent;
   box-shadow: none;
   padding: 6px 1px 7px 1px;
   color: #888a85;
+  text-shadow: none;
+  font-weight: bold;
 }
 
 layoutpane > box > box:first-child > stackswitcher > button:checked {
-  color: white;
+  border-bottom: 3px solid @theme_selected_bg_color;
+  color: #fafafa;
+  text-shadow: 0 1px #101010;
 }