diff --git a/packages/grafana-ui/src/components/uPlot/plugins/TooltipPlugin2.tsx b/packages/grafana-ui/src/components/uPlot/plugins/TooltipPlugin2.tsx
index 51b3a1cda48..b72e6e10edd 100644
--- a/packages/grafana-ui/src/components/uPlot/plugins/TooltipPlugin2.tsx
+++ b/packages/grafana-ui/src/components/uPlot/plugins/TooltipPlugin2.tsx
@@ -303,7 +303,8 @@ const getStyles = (theme: GrafanaTheme2) => ({
     whiteSpace: 'pre',
     borderRadius: theme.shape.radius.default,
     position: 'absolute',
-    background: theme.colors.background.secondary,
+    background: theme.colors.background.primary,
+    border: `1px solid ${theme.colors.border.weak}`,
     boxShadow: `0 4px 8px ${theme.colors.background.primary}`,
     userSelect: 'text',
   }),