[gtk+] Make sure stopped spinner stay visible

[Matthias Clasen <matthiasc src gnome org>]

commit b6f33919b713e95d9087a21db6d50899b8396c9d
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Dec 6 23:49:03 2017 -0500

    Make sure stopped spinner stay visible
    
    This demo needs stopped spinners to be visible,
    so the user can interact with them.

 demos/gtk-demo/dnd.css |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/demos/gtk-demo/dnd.css b/demos/gtk-demo/dnd.css
index e9cfd56..8d0f22a 100644
--- a/demos/gtk-demo/dnd.css
+++ b/demos/gtk-demo/dnd.css
@@ -1,6 +1,3 @@
-demo {
-  background: red;
-  border: 1px solid black;
-  min-width: 30px;
-  min-height: 30px;
+spinner.demo {
+  opacity: 1;
 }