You can do this with custom css.
Add a specific class on the page in which you have the delete button. For example, give the page the class ‘page_toggle_confirm_button’
In scss you can now add:
.page_toggle_confirm_button .mxui_widget_ConfirmationDialog_0 {
.btn-primary {
background: $white;
}
.btn:not(.btn-primary) {
background: $background-primary;
}
}
In this way, the confirm/cancel button colorings are toggled for this specific page.