NewPanelEdit: Minor style tweaks & fix to transparent panels (#23353)

* NewPanelEdit: Minor style tweaks

* Fixed ts issue

* Tweaked breakpoint

public/app/plugins/panel/stat/StatPanel.tsx

@@ -95,6 +95,7 @@ export class StatPanel extends PureComponent<PanelProps<StatPanelOptions>> {
         width={width}
         height={height}
         source={data}
+        itemSpacing={3}
         renderCounter={renderCounter}
         autoGrid={true}
         orientation={options.orientation}