Hello,
Please try to use this code in custom css:
.wide .wrapper {
background-image: url(http://www.slicepumpkit.com/wp-content/uploads/2017/09/BACK-GROUND-72-1.jpg);
background-attachment: fixed;
background-repeat: no-repeat;
background-position: center center;
background-size: cover;
}
.wide .container_footer_bg,
.wide .footer_container,
.wide .footer-black-bg, .container,
.wide .footer-black-bg .container,
.wide .header-bg {
background-color: transparent !important;
}
Regards