feat: adiciona função do botão de ir para o topo

desafio-react-e-typescript/src/components/Footer/Footer.tsx

@@ -24,6 +24,20 @@ import vtexpowered from "../../assets/images/vtexpowered.svg";
 import m3developed from "../../assets/images/m3developed.svg";
 
 const Footer = () => {
+  const [visible, setVisible] = useState(false);
+  useEffect(() => {
+    const handleResize = () => {
+      if (window.pageYOffset > 100) {
+        setVisible(true);
+      } else {
+        setVisible(false);
+      }
+    };
+    window.addEventListener("scroll", handleResize);
+    return () => {
+      window.removeEventListener("scroll", handleResize);
+    };
+  }, []);
   return (
     <div>
       <Newsletter />
@@ -197,9 +211,11 @@ const Footer = () => {
             </a>
           </button>
           <button className={styles["button-icon"]}>
-            <a href="#header">
-              <img src={gototop} alt="" className={styles["go-top-icon"]} />
-            </a>
+            {visible && (
+              <a href="#header">
+                <img src={gototop} alt="" className={styles["go-top-icon"]} />
+              </a>
+            )}
           </button>
         </div>
       </div>