diff --git a/master.css b/master.css
index 21f78b2..08df3c8 100644
--- a/master.css
+++ b/master.css
@@ -27,8 +27,16 @@
 }
 
 .cube {
-    transform: rotate3d(1, 0, 0, 90deg);
-    transition: 4s;
+    animation: tourner 1s ease-in-out;
+}
+
+@keyframes tourner {
+    0%{
+        transform: rotate3d(1, 0, 0, 0);
+    }
+    100%{
+        transform: rotate3d(1, 0, 0, 360deg);
+    }
 }
 
 .cube__face--0  { background: hsla(  0, 100%, 50%, 1); }