Hi idetec,
add one of the following code snippets to the Custom CSS field, under Form Options in Optin Forms:
If you’re using form design 01:
#optinforms-form1{background:transparent!important;}
If you’re using form design 02:
#optinforms-form2{background:transparent!important;}
If you’re using form design 03:
#optinforms-form3{background:transparent!important;}
If you’re using form design 04:
#optinforms-form4{background:transparent!important;}
If you’re using form design 05:
#optinforms-form5{background:transparent!important;}
