move styles to re-usable .inline-dialog

src/pretix/presale/templates/pretixpresale/event/fragment_cart.html

@@ -511,7 +511,7 @@
                 </button>
             </p>
         </form>
-        <dialog role="alertdialog" id="cart-extend-feedback-dialog" aria-labelledby="cart-extend-feedback">
+        <dialog role="alertdialog" id="cart-extend-feedback-dialog" class="inline-dialog" aria-labelledby="cart-extend-feedback">
             <form method="dialog">
                 <p>
                     <span id="cart-extend-feedback" class="text-muted sr-only"></span>

src/pretix/static/pretixbase/scss/_dialogs.scss

@@ -1,3 +1,10 @@
+dialog.inline-dialog {
+  position: static;
+  padding: 0;
+  margin: 0;
+  border: none;
+}
+
 /* Modal dialogs using HTML5 dialog tags for accessibility */
 dialog.modal-card {
   border: none;

src/pretix/static/pretixpresale/scss/_cart.scss

@@ -254,12 +254,6 @@
 #cart-deadline-short {
     font-variant-numeric: tabular-nums;
 }
-#cart-extend-feedback-dialog {
-    position: static;
-    padding: 0;
-    margin: 0;
-    border: none;
-}
 .btn-invisible {
     opacity: 0 !important;
 }