Prevent dialog from scrolling out of view using CSS

Closes #3506524

css/autosave_form.css

@@ -18,3 +18,16 @@
   padding: 1.5rem 0;
   max-width: 650px;
 }
+
+body:has(.autosave-dialog) {
+  overflow: clip;
+}
+
+body .autosave-dialog {
+  overflow-y: scroll;
+  overflow-x: hidden;
+  margin-top: 1vh;
+  margin-bottom: 1vh;
+  display: flex;
+  flex-direction: column;
+}
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