Use the following code enter in single.php file


<div class="nextprv">
			<div class="alignleft"><?php previous_post_link('&laquo; %link') ?></div>
				<div class="alignright"><?php next_post_link('%link &raquo;') ?></div></div>


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Use the following code enter in style.css file


.nextprv {
	font-size: 14px;
	margin: 20px 5px 0px 5px;
	padding: 2px 5px 17px 5px;
	border-top: 1px solid #CFE4F2;
	
}