diff --git a/templates/nav_bar.html b/templates/nav_bar.html
index 6702bdf..8a52b38 100644
--- a/templates/nav_bar.html
+++ b/templates/nav_bar.html
@@ -1,4 +1,4 @@
-<nav class="navbar navbar-default inverted">
+<nav class="navbar navbar-default navbar-inverse">
   <div class="container-fluid">
     <!-- Brand and toggle get grouped for better mobile display -->
     <div class="navbar-header">
diff --git a/vote/models.py b/vote/models.py
index ec93860..c92be4c 100644
--- a/vote/models.py
+++ b/vote/models.py
@@ -4,18 +4,19 @@ from content.models import Content
 from django.contrib.auth.models import Group, User
 
 
+class Poll(models.Model):
+    voters_group = models.ForeignKey(Group, on_delete=models.CASCADE)
+    contents = models.ManyToManyField(Content)
+    title = models.CharField(max_length=1024)
+
+
 class Vote(models.Model):
     votant = models.ForeignKey(User, on_delete=models.CASCADE)
     content = models.ForeignKey(Content, on_delete=models.CASCADE)
+    poll = models.ForeignKey(Poll, on_delete=models.CASCADE)
     vote = models.IntegerField(
         validators=[
             validators.MaxValueValidator(5),
             validators.MinValueValidator(0)
         ]
     )
-
-
-class Poll(models.Model):
-    voters_group = models.ForeignKey(Group, on_delete=models.CASCADE)
-    contents = models.ManyToManyField(Content)
-    title = models.CharField(max_length=1024)