Images in Marketo

Hello everyone,

I'm having troubles with image alignment in Marketo, specifically on the landing pages - the images are left aligned. However when I preview the template the images are center aligned (as designed), they look center aligned when I open the html file in the browser. But only in Marketo when I preview the landing page the images are left aligned. The images are set with the following values in the CSS file:

          margin: 0 auto;

         display: block;

         clear: both;

         position: relative;

Thanks a lot!