Fix margin around buttons

shiftregister/app/templates/partials/shift_listitem.html

@@ -9,9 +9,9 @@
             <strong>Dauer:</strong> {{ shift.duration }}
         </div>
         <div class="buttons is-right">
-            <a class="button is-info is-small" href="{% url 'shift' shift.id %}">Details</a>
+            <a class="button is-info is-small mr-0" href="{% url 'shift' shift.id %}">Details</a>
 {% if not registered %}
-            <a class="button is-primary is-small ml-3" href="{% url 'shift' shift.id %}">Mithelfen</a>
+            <a class="button is-primary is-small mr-0" href="{% url 'shift' shift.id %}">Mithelfen</a>
 {% endif %}
         </div>
     </div>