feat: improve style of update buttons

src/fellchensammlung/static/fellchensammlung/css/main.scss

@@ -149,6 +149,15 @@ p > a.button {
   filter: brightness(0.9);
 }
 
+
+.card-footer .card-footer-item.is-warning {
+  background-color: sass.$warning;
+}
+
+.card-footer .card-footer-item.is-warning:hover {
+  filter: brightness(0.9);
+}
+
 /*******/
 /* MAP */
 /*******/

src/fellchensammlung/templates/fellchensammlung/partials/partial-check-adoption-notice.html

@@ -15,9 +15,10 @@
                 </a>
             </p>
         {% endif %}
+    </div>
     <div class="card-footer">
-            <div class="card-footer-item">
-                <form method="post" class="card-footer-item">
+        <div class="card-footer-item is-confirm">
+            <form method="post">
                 {% csrf_token %}
                 <input type="hidden"
                        name="adoption_notice_id"
@@ -26,7 +27,7 @@
                 <button class="" type="submit">{% translate "Vermittlung noch aktuell" %}</button>
             </form>
         </div>
-            <div class="card-footer-item">
+        <div class="card-footer-item is-warning">
             <form method="post">
                 {% csrf_token %}
                 <input type="hidden"
@@ -38,4 +39,3 @@
         </div>
     </div>
 </div>
-</div>