[create-pull-request] automated change

Author: encap

public/code/CSS/spinner_keyframes.css

@@ -0,0 +1,8 @@
+@keyframes spinner {
+  0% {
+    transform: translate3d(-50%, -50%, 0) rotate(0deg);
+  }
+  100% {
+    transform: translate3d(-50%, -50%, 0) rotate(360deg);
+  }
+}