How to display Search box within content in WordPress. http://sridharkatakam.com/display-search-box-within-content-wordpress/

functions.php

<?php
//* Do NOT include the opening php tag

//* Create a [my_search] shortcode for displaying search box
add_shortcode('my_search', 'display_search');
function display_search($atts) {

	ob_start();
		echo '<div class="my-search">';
		get_search_form();
		echo '</div>';
	return ob_get_clean();

}

style.css

.my-search {
	margin-bottom: 28px;
}

.my-search input[type="search"] {
	max-width: 300px;
}