change <tr:inputFile> message style

[chen young]

Hi,

How can I modify the <tr:inputFile> massage style?

For example:
In the following example in case there is no file I will get the following massage ” You must enter a value.”

<tr:inputFile id="ipList" 
                   simple="true"
                   valueChangeListener="#{fileUpload.fileUploaded}" 
                   required="true"
                  onchange="uploadFile(this,#{user.rendered})"/>

I want to change the message color to red.

I also try to change the color via the application skin something like this
af|inputFile::value {
color: #FF0000;
}

Can someone please send example ?

Thanks