How do I change the tan background to a blue?

How do I change the tan background to a blue?

There is currently a theme applied to your form that is causing the currently tan background.  To overwrite the theme, add this code to your form:

.form-all {
    background : #69d2e7 !imporant;
}

.form-section.page-section {
    background : #69d2e7 !important;
}

http://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes

Here is how the form would look with the code added:

https://form.jotform.com/61725004411947