diff --git a/css/userContent-files/webextension-tweaks/youtube_video_and_audio_downloader.css b/css/userContent-files/webextension-tweaks/youtube_video_and_audio_downloader.css
new file mode 100644
index 0000000..4513484
--- /dev/null
+++ b/css/userContent-files/webextension-tweaks/youtube_video_and_audio_downloader.css
@@ -0,0 +1,31 @@
+/*! Alters the webextension YouTube Video And Audio Downloader (WebEx)
+  IMPORTANT: change the Internal UUID */
+@-moz-document url-prefix("moz-extension://{f73df109-8fb4-453e-8373-f59e61ca4da3}/") {
+  body, #content {
+    color: var(--tone-2) !important;
+    background-color: var(--tone-8) !important;
+  }
+  body>div>div:not(#items) {
+    background-color: var(--tone-5) !important;
+  }
+  #settings {
+    background-color: var(--tone-8) !important;
+    border-top: 1px solid #fff;
+  }
+  #settings>div {
+    background-color: transparent;
+  }
+  body[data-loading=true] {
+    background-color: var(--tone-8) !important;
+  }
+  .item {
+    background-color: var(--tone-5) !important;
+    color: var(--tone-2) !important;
+  }
+  #close {
+    background-color: var(--tone-5) !important;
+  }
+  #externals {
+    background-color: var(--tone-5) !important;
+  }
+}