Close menus when the rest of the page is clicked

Ce-authored-by: Joachim <joachim.robert@protonmail.com>

bookwyrm/static/css/bookwyrm.css

@@ -119,6 +119,15 @@ details .dropdown-menu {
     display: block !important;
 }
 
+details.dropdown[open] summary.dropdown-trigger::before {
+    content: "";
+    position: fixed;
+    top: 0;
+    bottom: 0;
+    left: 0;
+    right: 0;
+}
+
 summary::marker {
     content: none;
 }