Styling a file input button which matches current template styling and is also responsive across browsers

Closed - This job posting has been filled and work has been completed.

Job Description

Hi,
Need someone to style a file input button which will match with the purchased theme/template style. The style should be both functional and user freindly and should be same across different browsers and be responsive as the purchased theme is a responsive theme.
The purchased theme can be viewed at http://us-themes.com/html-themes/Astra/contact-2.html

The file input needs to be added abouve the send button.

Best regards