Dropdown padding gets lost when previewed in browser

I love that I can now style some aspects of a dropdown menu in RP9. But I’m noticing that some aspects of the styling get lost when I preview in my Chrome browser. If I adjust the padding of my dropdown menu in Axure to have a 16 px. left indent, the left padding goes away when I preview the dropdown in Chrome (see attached screenshot). Any assistance is greatly appreciated!

-adam