1 files changed, 35 insertions, 0 deletions
diff --git a/mailnews/base/content/newmailalert.css b/mailnews/base/content/newmailalert.css
new file mode 100644
index 000000000..52746fae0
--- /dev/null
+++ b/mailnews/base/content/newmailalert.css
@@ -0,0 +1,35 @@
+/* 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/. */
+
+#alertContainer {
+  opacity: 0;
+}
+
+#alertContainer[noanimation] {
+  opacity: 1;
+}
+
+#alertContainer[fade-in] {
+  animation-timing-function: ease-out;
+  animation-duration: 2s;
+  animation-fill-mode: both;
+  animation-name: fade-in;
+}
+
+@keyframes fade-in {
+  from {opacity: 0;}
+  to {opacity: 1;}
+}
+
+#alertContainer[fade-out] {
+  animation-timing-function: ease-in;
+  animation-duration: 2s;
+  animation-fill-mode: both;
+  animation-name: fade-out;
+}
+
+@keyframes fade-out {
+  from {opacity: 1;}
+  to {opacity: 0;}
+}