diff --git a/src/theme/style.css b/src/theme/style.css
index 59c4f21a..46165604 100644
--- a/src/theme/style.css
+++ b/src/theme/style.css
@@ -65,7 +65,7 @@ input[type=number] {
   -moz-appearance: textfield !important;
 }
 
-.stats-popover .popover-content {
+.stats-popover::part(content) {
   width:300px;
 }