If you have the following in html file, what would you put in css file?

PHP Code:
<input type="text" name="username" id="username" size="15" tabindex="1" /> 
just put this stuff in css:
div#username {size=15; tabindex=1}

And in html file just declare:
<input type="text" name="username" id="username" />

and when browser calls the html, if would make it as:
PHP Code:
<input type="text" name="username" id="username" size="15" tabindex="1" /> 
Am I right?