diff --git a/static/main.html b/static/main.html
index 967b2e2..f31fcb2 100644
--- a/static/main.html
+++ b/static/main.html
@@ -168,6 +168,7 @@
             // Instead, we can temporarily override the animation property to 'none' then the
             // animation will restart when we re-inheirit from the stylesheet.
             let flashers = $('.flash').each((_, e) => {
+              if (e.style.animationPlayState === 'running') return;
               e.style.animation = '';
               e.style.animationPlayState = 'running';