When I try to visit your site using https the browser gives a warning about the ssl certificate not being valid for your domain.
autocreditxchange.com uses an invalid security certificate.
The certificate is only valid for the following names:
*.arvixe.com , arvixe.com
(Error code: ssl_error_bad_cert_domain)
The other problem I see when I view the source of your page (using http) is that you are using a remote font:
<link href="http://fonts.googleapis.com/css?family=Droid+Serif" rel="stylesheet" type="text/css" />
If the containing page uses https that font will be blocked since it is not using https.
Also if you are using background images in css make sure you use a relative path and do not put any references to images in the css using http.
See also Solving Browser Security Warnings
Hope that herlps,