Need Help Fixing Insecure Image Resource on Standard Jotform Theme

Google Chrome is indicating an insecure image resource on the secure Jotform I am using on my website. Apparently, the problem is the color-bar across the top of the 'Dark Atom' theme from Jotform. Would it be possible for someone from Jotform to change the resource address from http to https? Here is the image link I am referring to: http://shots.jotform.com/elton/header_colors.png.

Here is the address to my registration page: https://www.hardballrally.com/register/

This is a copy of the Google Chrome image warning:

"Mixed Content: The page at 'https://www.hardballrally.com/register/' was loaded over HTTPS, but requested an insecure image 'http://shots.jotform.com/elton/header_colors.png'. This content should also be served over HTTPS."

Thank you for your help.

All submissions are now using SSL unlike before. The theme was created before the SSL limits were lifted. Please try inserting this custom CSS code:

.form-all {
background: url(https://shots.jotform.com/elton/header_colors.png) repeat-x top center / 300px;
}

Here's a guide on How-to-Inject-Custom-CSS-Codes. Here's the result:

Hope that helps. Thank you.

Thank you for your answer. As part of another support request, your colleague Welvin corrected the image problem.