1 files changed, 33 insertions, 0 deletions
diff --git a/toolkit/themes/shared/aboutServiceWorkers.css b/toolkit/themes/shared/aboutServiceWorkers.css
new file mode 100644
index 0000000000..857050460f
--- /dev/null
+++ b/toolkit/themes/shared/aboutServiceWorkers.css
@@ -0,0 +1,33 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+.warningBackground {
+  display: none;
+  background-color: var(--in-content-page-background);
+  width: 100%;
+  height: 100%;
+  z-index: 10;
+  top: 0;
+  inset-inline-start: 0;
+  position: fixed;
+}
+
+.warningMessage {
+  min-width: 330px;
+  max-width: 50em;
+  margin: 4em auto;
+  border: 1px solid var(--in-content-box-border-color);
+  border-radius: 10px;
+  padding: 3em;
+  background-color: var(--in-content-box-background);
+  text-align: center;
+}
+
+.active {
+  display: block;
+}
+
+.inactive {
+  display: none;
+}