refactor: remove GSAP dependency and update code structure for improved readability

src/style.css

@@ -0,0 +1,14 @@
+* {
+    margin: 0;
+    padding: 0;
+}
+
+html, body {
+    overflow: hidden;
+}
+
+.webgl {
+    position: fixed;
+    top: 0;
+    left: 0;
+}