Hello,
I don’t see any background on the site http://www.cristalaventura.com.br, only the slide from revolution slider. Do you mean you want to show this background http://cristalaventura.com.br/wp-content/themes/dt-the7/inc/presets/images/full/skin02r.general-boxed-bg-image.jpg ?
If so add this code in custom.css file:
#page {
background-image: url("http://cristalaventura.com.br/wp-content/themes/dt-the7/inc/presets/images/full/skin02r.general-boxed-bg-image.jpg") !important;
}
Regards,
Eva Kemp.