Changing the WP Title Style reflects every web part on the Page

Hi all,

When I edit the Style of a Web Part with a style like the following

<style type="text/css">
.ms-WPTitle {font-weight:Bold !important; color:gray !important;}</style>

It reflects every webpart's title for the Page..How can I make it effect for only a single Web Part.

Thanks,

K.V.N.PAVAN