diff --git a/front_end/index.html b/front_end/index.html
index d539014..1e3f5bc 100644
--- a/front_end/index.html
+++ b/front_end/index.html
@@ -143,6 +143,20 @@
button.magenta {
background: #F0F;
}
+ button.win {
+ animation-duration: 400ms;
+ animation-name: blink;
+ animation-iteration-count: infinite;
+ animation-direction: alternate;
+ }
+ @keyframes blink {
+ from {
+ opacity: 1;
+ }
+ to {
+ opacity: 0;
+ }
+ }