initial commit

main.js

@@ -0,0 +1,35 @@
+const scrollchecks = () => {
+    var el = document.getElementById("header");
+    el.style.backgroundPositionY = 50 + (document.documentElement.scrollTop/el.scrollHeight) / 2 * 100 + "%";
+    Array.from(document.getElementsByClassName("scrolly")).forEach(el => {
+        let box = el.getBoundingClientRect();
+        if (box.bottom < 0 || box.top >= window.innerHeight) {
+            el.classList.add("scrolly-out");
+            el.classList.remove("scrolly-in");
+            el.classList.remove("scrolly-onedge");
+        }
+        else {
+            el.classList.remove("scrolly-out");
+            el.classList.add("scrolly-in");
+            el.classList.add("scrolly-entered");
+            if (box.top <= 0 || box.bottom >= window.innerHeight) {
+                el.classList.add("scrolly-onedge");
+            }
+            else {
+                el.classList.remove("scrolly-onedge");
+            }
+        }
+        if (box.top + box.height / 2 <= window.innerHeight / 2) {
+            el.classList.add("scrolly-tophalf");
+            el.classList.remove("scrolly-bottomhalf");
+        }
+        else {
+            el.classList.remove("scrolly-tophalf");
+            el.classList.add("scrolly-bottomhalf");
+        }
+    });
+};
+window.addEventListener("scroll", scrollchecks);
+window.addEventListener("wheel", scrollchecks);
+window.addEventListener("resize", scrollchecks);
+window.addEventListener("load", scrollchecks);