Added files

js/button.js

@@ -0,0 +1,14 @@
+addEventListener("load", () => {
+    const onAnimationFinished = (e) => {
+        e.target.remove();
+    };
+    const onClick = (e, btn) => {
+        const clickElement = document.createElement("div");
+        clickElement.className = "click";
+        clickElement.addEventListener("animationend", onAnimationFinished);
+        btn.appendChild(clickElement);
+    };
+    for (const btn of document.getElementsByClassName("btn")) {
+        btn.addEventListener("click", (e) => onClick(e, btn) );
+    };
+});