DO-SOPT-WEB · Jun-min2 · Oct 22, 2023 · Oct 23, 2023 · Oct 23, 2023 · Oct 23, 2023
diff --git a/index.js b/index.js
@@ -0,0 +1,12 @@
+const button = document.getElementById('top');
+
+let opacity = 0;
+button.style.opacity = opacity;
+window.addEventListener('scroll', function() {
+
+    const scrollPosition = window.scrollY / (document.documentElement.scrollHeight - window.innerHeight);
+
+    opacity = scrollPosition;
+
+        button.style.opacity = opacity;
+});
diff --git a/problem4.css b/problem4.css
diff --git a/problem4.html b/problem4.html