diff --git a/app/views/layouts/mailer.html.erb b/app/views/layouts/mailer.html.erb
index f878fba23..51acf3ea0 100644
--- a/app/views/layouts/mailer.html.erb
+++ b/app/views/layouts/mailer.html.erb
@@ -49,13 +49,15 @@
       }
 
       .avatar {
-        border-radius: 50%;
+        aspect-ratio: 1;
+        border-radius: 2.5em;
         color: white;
         display: block;
         font-weight: 600;
         height: 2.5em;
         line-height: 2.5em;
         mso-line-height-rule: exactly;
+        object-fit: cover;
         overflow: hidden;
         text-align: center;
         width: 2.5em;