diff --git a/static/css/style.css b/static/css/style.css
index 0e4cf1b..6d05c08 100644
--- a/static/css/style.css
+++ b/static/css/style.css
@@ -39,18 +39,14 @@ body {
     margin-right: 10px;
 }
 
-.navbar-logo, .login-logo {
+.navbar-logo {
     height: 35px;
-    width: auto;
-    object-fit: contain;
-    max-width: 100%;
-    image-rendering: -webkit-optimize-contrast;
-    image-rendering: crisp-edges;
+    width: 35px;
 }
 
 .login-logo {
-    height: 100px;
-    margin: 0 auto 1rem;
+    height: 80px;
+    width: 80px;
 }
 
 .nav-link {
diff --git a/templates/base.html b/templates/base.html
index 2c57184..627880b 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -96,6 +96,7 @@
         {% with messages = get_flashed_messages(with_categories=true) %}
             {% if messages %}
                 {% for category, message in messages %}
+                    {% if not (category == 'success' and message == 'Login realizado com sucesso!') %}
                     <div class="alert alert-{{ category }} alert-dismissible fade show" role="alert">
                         {% if category == 'success' %}
                             <i class="fas fa-check-circle"></i>
@@ -109,6 +110,7 @@
                         {{ message }}
                         <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
                     </div>
+                    {% endif %}
                 {% endfor %}
             {% endif %}
         {% endwith %}
@@ -121,9 +123,21 @@
     <script src="{{ url_for('static', filename='js/forms.js') }}"></script>
     {% block extra_js %}{% endblock %}
 
-    {% if current_user is defined and current_user.is_authenticated %}
     <script>
-        // Verificar status da sessão a cada 5 minutos
+        // Auto-dismiss para alertas após 5 segundos
+        document.addEventListener('DOMContentLoaded', function() {
+            const alerts = document.querySelectorAll('.alert');
+            alerts.forEach(function(alert) {
+                setTimeout(function() {
+                    if (alert) {
+                        bootstrap.Alert.getOrCreateInstance(alert).close();
+                    }
+                }, 5000);
+            });
+        });
+
+        {% if current_user is defined and current_user.is_authenticated %}
+        // Verificar a sessão a cada 5 minutos
         function checkSession() {
             fetch('/check_session')
                 .then(response => response.json())
@@ -144,7 +158,7 @@
                 checkSession();
             }
         });
+        {% endif %}
     </script>
-    {% endif %}
 </body>
 </html>
\ No newline at end of file