How to style HTML file upload with CSS?

Styling <input type=”file”> is problematic, because most of the browsers don’t apply any styling to it.
But there is a nice hack, which works in major browser (including Firefox and Internet Explorer).
You just need to place a span, and in that space- nice looking text field which will imitate upload field and then the right upload [...]

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Source: http://de77.com/html/how-to-style-html-file-upload-with-css