diff --git a/frontend/vanilla/html/login.html b/frontend/vanilla/html/login.html
index a619827..3357c43 100644
--- a/frontend/vanilla/html/login.html
+++ b/frontend/vanilla/html/login.html
@@ -83,7 +83,7 @@
             <div class="text-center text-lg-start mt-4 pt-2">
               <button type="button" onclick="login()" class="btn btn-primary btn-lg"
                 style="padding-left: 2.5rem; padding-right: 2.5rem;">Login</button>
-              <p class="small fw-bold mt-2 pt-1 mb-0">Don't have an account? <a href="register.html">Register</a></p>
+              <p class="small mt-2 pt-1 mb-0">Don't have an account? <a class="link-primary text-decoration-none" href="register.html">Register</a></p>
             </div>
           </form>
         </div>
@@ -133,12 +133,26 @@
      * calls. Retrurns true or false
     */
     function validateFields(){
-      const email = document.getElementById("email").value;
-      const password = document.getElementById("password").value;
-      if(!email || !password || !validateEmail(email) || password.length < 5){
-        return false;
+      const emailField = document.getElementById("email");
+      const passwordField = document.getElementById("password");
+      var isFormValid = true;
+
+      if(!emailField.value || !validateEmail(emailField.value)){
+        emailField.classList.add("is-invalid");
+        isFormValid = false;
       }
-      return true;
+      else{
+        emailField.classList.remove("is-invalid");
+      }
+
+      if(!passwordField.value){
+        passwordField.classList.add("is-invalid");
+        isFormValid = false;
+      }
+      else{
+        passwordField.classList.remove("is-invalid");
+      }
+      return isFormValid;
     }
 
     /*
diff --git a/frontend/vanilla/html/register.html b/frontend/vanilla/html/register.html
index 032ce7b..bf4b3c6 100644
--- a/frontend/vanilla/html/register.html
+++ b/frontend/vanilla/html/register.html
@@ -112,7 +112,7 @@
                         <div class="row">
                             <div class="col-12">
                                 <hr class="mt-5 mb-4 border-secondary-subtle">
-                                <p class="m-0 text-secondary text-center">Already have an account? <a href="#!"
+                                <p class="m-0 text-secondary text-center">Already have an account? <a href="login.html"
                                         class="link-primary text-decoration-none">Sign in</a></p>
                             </div>
                         </div>
diff --git a/frontend/vanilla/js/utils.js b/frontend/vanilla/js/utils.js
index 63beb44..b182b07 100644
--- a/frontend/vanilla/js/utils.js
+++ b/frontend/vanilla/js/utils.js
@@ -14,7 +14,7 @@ function getCookie(name) {
  * Validates an e-mail using a RegExpression
  *
  * @param {*} email
- * @returns 
+ * @returns true or false
  */
 function validateEmail(email) {
     return String(email)