diff --git a/src/public/javascripts/dialogs/markdown_import.js b/src/public/javascripts/dialogs/markdown_import.js
index e0c7b1dd7..b2ebdbef5 100644
--- a/src/public/javascripts/dialogs/markdown_import.js
+++ b/src/public/javascripts/dialogs/markdown_import.js
@@ -3,9 +3,9 @@ import infoService from "../services/info.js";
 import utils from "../services/utils.js";
 import noteDetailTextService from "../services/note_detail_text.js";
 
-const $markdownImportDialog = $('#markdown-import-dialog');
-const $markdownImportTextarea = $('#markdown-import-textarea');
-const $markdownImportButton = $('#markdown-import-button');
+const $dialog = $('#markdown-import-dialog');
+const $importTextarea = $('#markdown-import-textarea');
+const $importButton = $('#markdown-import-button');
 
 async function convertMarkdownToHtml(text) {
     await libraryLoader.requireLibrary(libraryLoader.COMMONMARK);
@@ -35,25 +35,25 @@ async function importMarkdownInline() {
     else {
         $("input[name='search-text']").focus();
 
-        glob.activeDialog = $markdownImportDialog;
+        glob.activeDialog = $dialog;
 
-        $markdownImportDialog.modal();
+        $dialog.modal();
     }
 }
 
 async function sendForm() {
-    const text = $markdownImportTextarea.val();
+    const text = $importTextarea.val();
 
-    $markdownImportDialog.modal('hide');
+    $dialog.modal('hide');
 
     await convertMarkdownToHtml(text);
 
-    $markdownImportTextarea.val('');
+    $importTextarea.val('');
 }
 
-$markdownImportButton.click(sendForm);
+$importButton.click(sendForm);
 
-$markdownImportDialog.bind('keydown', 'ctrl+return', sendForm);
+$dialog.bind('keydown', 'ctrl+return', sendForm);
 
 // for CKEditor integration (button on block toolbar)
 window.glob.importMarkdownInline = importMarkdownInline;
diff --git a/src/public/stylesheets/style.css b/src/public/stylesheets/style.css
index 30abfe676..2fcf454b3 100644
--- a/src/public/stylesheets/style.css
+++ b/src/public/stylesheets/style.css
@@ -417,6 +417,11 @@ button.icon-button {
 
 /* Themes */
 
+html {
+    /* this fixes FF filter vs. position fixed bug: https://github.com/zadam/trilium/issues/233 */
+    height: 100%;
+}
+
 html.theme-black, html.theme-black img, html.theme-black video {
     filter: invert(100%) hue-rotate(180deg);
 }