diff --git a/src/style.css b/src/style.css
index 6f27499..ad61763 100644
--- a/src/style.css
+++ b/src/style.css
@@ -25,3 +25,6 @@ mjx-container[jax="SVG"][display="true"] {
 mjx-container svg {
   max-width: 100%;
 }
+
+@keyframes sune-spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
+.sune-generating { display: inline-block; animation: sune-spin 4s linear infinite; color: #9ca3af; }