diff --git a/renda.js b/renda.js
new file mode 100644
index 0000000..6ee75c9
--- /dev/null
+++ b/renda.js
@@ -0,0 +1,36 @@
+"use strict";
+const body = document.querySelector("body");
+const background = document.querySelector(".background");
+const countDisplay = document.querySelector(".countDisplay");
+const result = document.querySelector(".result");
+
+let count = 0;
+
+
+const eventType = window.ontouchstart !== null ? "click" : "touchstart";
+const addCount = function (e) {
+
+  count++;
+  countDisplay.textContent = count;
+
+};
+
+const shrinkAnim = function () {
+  body.removeEventListener(eventType, shrinkAnim);
+  body.addEventListener(eventType, addCount);
+  background
+    .animate(
+      {offset: [0, 0.9],},
+      { duration: 3000, fill: "forwards" }
+    )
+    .finished 
+    .then(() => {
+      body.removeEventListener(eventType, addCount);
+      result.textContent = "はじめに戻る";
+      result.classList.add("blink");
+      result.addEventListener("click", () => {
+        location.reload();
+      });
+    });
+};
+body.addEventListener(eventType, shrinkAnim);
\ No newline at end of file