Hello,
Thanks for reaching out! To set the z-index for your buttons so they go behind or in front of major elements on your website as needed, you would make a CSS addition like this example:
.buttonizer {
z-index: 999999 !important;
}
This CSS should be adjusted to your needs and placed on your site, rather than on the Buttonizer side.
Hope that helps! Please let us know if you need any additional help.