blog info can not found file path

this is my css file path but i can not implement this css file into my wordpress theme.i am already styles.css file into my theme folder. when i am trying to show page source i can not my syles.css file there. is there any mistake in my file path.

 <link rel="stylesheet" id="contact-form-7-css" href="<?php` bloginfo('styles.css'); ?>" type="text/css" />