dont show cancel text for passed shifts, put shift in container

shiftregister/app/models.py

@@ -20,6 +20,8 @@ class Shift(models.Model):
     # todo: add helper amount override field
     def __str__(self):
         return f"{self.room.name}: {self.start_at}"
+    def has_ended(self):
+        return (self.start_at + self.duration) < timezone.now()
 
 
 class Helper(models.Model):

shiftregister/app/templates/shift.html

@@ -2,6 +2,7 @@
 
 {% block title %}Schichtansicht{% endblock %}
 {% block content %}
+<div class="box">
 {% if is_registered %}
 <div>Du bist zu dieser Schicht angemeldet</div>
 {% endif %}
@@ -22,8 +23,9 @@ Dauer: {{ shift.duration }}<br>
     {{ shift_form.as_p }}
     <input type="submit" value="Abmelden">
 </form>
-{% else %}
+{% elif not shift.has_ended %}
 Bitte wende dich an den Infopoint, falls du es nicht zu deiner Schicht schaffst.
 {% endif %}
 {% endif %}
+</div>
 {% endblock %}