diff --git a/gtk/gtk-win32-base.css b/gtk/gtk-win32-base.css
index ee9882fc04..24e2f9471a 100644
--- a/gtk/gtk-win32-base.css
+++ b/gtk/gtk-win32-base.css
@@ -834,3 +834,354 @@ GtkStatusbar > GtkFrame {
     background-image:  -gtk-win32-theme-part(status, 3 1);
 }
 */
+
+@keyframes spinner {
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+}
+
+.spinner {
+  background-color: transparent;
+  background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
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+  background-position: 25.00% 6.70%, 6.70% 25.00%, 0.00% 50.00%, 6.70% 75.00%, 25.00% 93.30%, 50.00% 100.00%, 75.00% 93.30%, 93.30% 75.00%, 100.00% 50.00%, 93.30% 25.00%, 75.00% 6.70%, 50.00% 0.00%;
+  background-size: 20% 20%;
+  background-repeat: no-repeat;
+  transition: background-image 500ms ease-out;
+}
+
+.spinner:active {
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+                     -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent));
+  animation: spinner 1s infinite linear;
+}