Re-instating the DARK theme.

Change-Id: Ic499b4991e41747cc9472838397e5e57cd4ad089
diff --git a/web/gui/src/main/webapp/app/fw/layer/dialog-theme.css b/web/gui/src/main/webapp/app/fw/layer/dialog-theme.css
index 213b7fa..23626d0 100644
--- a/web/gui/src/main/webapp/app/fw/layer/dialog-theme.css
+++ b/web/gui/src/main/webapp/app/fw/layer/dialog-theme.css
@@ -22,8 +22,11 @@
     background-color: #518ecc;
     color: white;
 }
+
+
+/* ========== DARK Theme ========== */
+
 .dark .dialog .dialog-button {
-    /* TODO: dark theme */
-    background-color: #518ecc;
-    color: white;
+    background-color: #345e85;
+    color: #cccccd;
 }