[feat] add back button

components/FixedButton.jsx

@@ -0,0 +1,9 @@
+const FixedButton = ({ children, onClick }) => (
+  <button
+  onClick={onClick}
+    className="fixed top-2 -left-2 md:left-10 flex justify-center items-center  rounded-full p-4  transition duration-300 ease-in-out z-50 transparent">
+    {children}
+  </button>
+);
+
+export default FixedButton;