About the icon in popup's button

Hello,
       Can you tell me,how to put the icon into the popup shortcode,I want to achieve this effect:
       [button title="申请使用" icon="icon-pencil-line" icon_position="right"]

       the popup shortcode is :[popup title="申请使用" padding="20" button="1" ][/popup]

       Thanks very much.

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