Search Code in Word press

 <form role="search" method="get" id="searchform" class="searchform" action="<?php echo esc_url( home_url( '/' ) ); ?>">

<input class="srch-input form-control" value="" placeholder="Search" name="s" id="s" type="text">

<span class="input-group-addon srch-bg">

<button class="srch-btn" id="searchsubmit" value="" type="submit">

                      <span class="fa fa-search"></span>

                        </button>  

                    </span>

</form>

And this code to place in function.php file

function my_search_form( $form ) {

$form = '<form role="search" method="get" id="searchform" class="searchform" action="' . home_url( '/' ) . '" >

<div><label class="screen-reader-text" for="s">' . __( 'Search for:' ) . '</label>

<input type="text" value="' . get_search_query() . '" name="s" id="s" />

<input type="submit" id="searchsubmit" value="'. esc_attr__( 'Search' ) .'" />

</div>

</form>';

return $form;

}

add_filter( 'get_search_form', 'my_search_form' );