diff --git a/gtk/theme/win32/gtk-win32-base.css b/gtk/theme/win32/gtk-win32-base.css
index 7ebbd78339..4064f4aa52 100644
--- a/gtk/theme/win32/gtk-win32-base.css
+++ b/gtk/theme/win32/gtk-win32-base.css
@@ -989,339 +989,24 @@ statusbar > frame {
 
 /* Spinner */
 
-@keyframes spinner {
-   0% { background-image: none,
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.916667)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.833333)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.75)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.666667)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.583333)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.5)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.416667)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.333333)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.25)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.166667)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.0833333)), to(transparent)); }
-   0% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.916667)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.833333)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.75)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.666667)), to(transparent)),
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.0833333)), to(transparent)); }
-   8% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.916667)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.833333)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.75)), to(transparent)),
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.25)), to(transparent)),
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.0833333)), to(transparent)),
-                          none; }
-   8% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.916667)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.833333)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.75)), to(transparent)),
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.25)), to(transparent)),
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)); }
-  16% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.833333)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.75)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.666667)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.583333)), to(transparent)),
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.916667)), to(transparent)); }
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.916667)), to(transparent)); }
-  25% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.75)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.666667)), to(transparent)),
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-  25% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.75)), to(transparent)),
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-  33% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.666667)), to(transparent)),
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.75)), to(transparent)); }
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.75)), to(transparent)); }
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-  75% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.25)), to(transparent)),
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.333333)), to(transparent)); }
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.0833333)), to(transparent)),
-                          none,
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.833333)), to(transparent)),
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.25)), to(transparent)); }
-  83% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.166667)), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.0833333)), to(transparent)),
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.25)), to(transparent)); }
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.166667)), to(transparent)); }
- 100% { background-image: none,
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.833333)), to(transparent)),
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.0833333)), to(transparent)); }
- 100% { background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.916667)), to(transparent)),
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-                          -gtk-gradient(radial, center center, 0, center center, 0.5, to(alpha(currentColor, 0.0833333)), to(transparent)); }
+@keyframes spin {
+  to { -gtk-icon-transform: rotate(1turn); }
 }
 
 spinner {
-  background-color: transparent;
-  background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
-                    -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
-                    -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
-                    -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
-                    -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
-                    -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
-                    -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
-                    -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
-                    -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
-                    -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
-                    -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent)),
-                    -gtk-gradient(radial, center center, 0, center center, 0.5, to(currentColor), to(transparent));
-  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;
+  background: none;
+  opacity: 0;
+  -gtk-icon-source: -gtk-icontheme('process-working-symbolic');
+}
+
+spinner:checked {
+  opacity: 1;
+  animation: spin 1s linear infinite;
+}
+
+spinner:checked:disabled
+{
+  opacity: 0.5;
 }
 
 spinner:active {