When i am converting invoice to PDF the black design of invoice will go
You seem to be showing two different invoices
yes i am just showing how the invoice should looks like !
You could be using two different themes on those invoices - who knows?
@Joe91 i think @Mazen wants to show when document convert in to PDF format it loose the filled back ground.
Software Screen View
PDF View

I understood that but by showing the same invoice it would eliminate the possibility, well almost, that they had used two different themes
Sorry to be pedantic but in my experience of IT problems almost anything can go wrong and users do sometimes omit important information because they do not realise its importance or relevance
I think this can be configured by the developer since browsers nowadays a checkbox to print or ignore Background graphics
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Since manager adopts the WYSIWYG design philosophy, I will place this in bugs and change the title accordingly.