diff --git a/src/static/scripts/admin.css b/src/static/scripts/admin.css
index dd153b1d..ab7d7344 100644
--- a/src/static/scripts/admin.css
+++ b/src/static/scripts/admin.css
@@ -58,3 +58,10 @@ img {
 .abbr-badge {
     cursor: help;
 }
+
+.theme-icon,
+.theme-icon-active {
+    display: inline-flex;
+    flex: 0 0 1.75em;
+    justify-content: center;
+}