diff --git a/src/index.html b/src/index.html
index 04bd19e..86823dc 100644
--- a/src/index.html
+++ b/src/index.html
@@ -23,15 +23,15 @@
           ><i class="fa fa-bars"></i
         ></a>
         <!-- TODO: Fix Issue, Desktop Nav Is Visible on Mobile -->
-        <a id="nav-logo" class="bar-item button padding-large white">JobSimulator.Dev</a>
-        <a id="nav-challenges" class="bar-item button padding-large hover-white">Browse Challenges</a>
-        <a id="nav-signup" class="bar-item button padding-large hover-white">Sign Up</a>
+        <a id="nav-logo" class="bar-item button padding-large white" href="#header">JobSimulator.Dev</a>
+        <a id="nav-challenges" class="bar-item button padding-large hover-white hide-small" href="#challenges">Browse Challenges</a>
+        <a id="nav-signup" class="bar-item button padding-large hover-white hide-small" href="#signup">Sign Up</a>
       </div>
 
       <!-- Navbar on small screens -->
       <div id="mobile-nav" class="bar-block white hide hide-large hide-medium large">
-        <a id="mobile-nav-challenges" class="bar-item button padding-large">Browse Challenges</a>
-        <a id="mobile-nav-signup" class="bar-item button padding-large">Sign Up</a>
+        <a id="mobile-nav-challenges" class="bar-item button padding-large" href="#challenges">Browse Challenges</a>
+        <a id="mobile-nav-signup" class="bar-item button padding-large" href="#signup">Sign Up</a>
       </div>
     </nav>
 
diff --git a/src/script.js b/src/script.js
index 529f585..bdcc1ac 100644
--- a/src/script.js
+++ b/src/script.js
@@ -30,6 +30,18 @@ addEventListener("submit", (event) => {
   // 2. empty email
   // 3. taken email
   // 4. repeat email
+  let inputUser = {username: email};
+  let foundUser = usersTable.findIndex((user) => user.username === inputUser.username);
+  
+  if(email === "") {
+    renderEmailEmptyError();
+  } else if(foundUser != -1) {
+    renderEmailTakenError();    
+  } else {
+    renderSuccess();
+    usersTable.push(inputUser);
+  }
+
 });
 
 let toggleNav = () => {
diff --git a/src/styles.css b/src/styles.css
index 2cbb72e..c3175d2 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -670,6 +670,7 @@ form > span {
 #jumbo-image {
   max-height: 20rem;
   /* TODO: Invert banner colors using CSS */
+  filter: invert(1);
 }
 
 @media (max-width: 600px) {
@@ -877,8 +878,8 @@ form > span {
 #challenge-grid {
   display: grid;
   /* TODO: Fix Issue, Tiles Need to be 2x2 Grid. Change only grid-template-columns */
-  grid-template-columns: none;
-  grid-auto-rows: 10rem;
+  grid-template-columns: 1fr 1fr;
+  grid-template-rows: 10rem 10rem;
   gap: 1rem;
   padding-top: 2rem;
 }