A search form lets visitors quickly find specific content, products, or information on your website without manually navigating through multiple pages. For creating search form in your custom theme kindly follow this steps. Copy these code and paste it anywhere in your wordpress theme.
<?php get_search_form(); ?>
default search form
<form role="search" method="get" id="searchform"
class="searchform" action="<?php echo esc_url( home_url( '/' ) ); ?>">
<div>
<label class="screen-reader-text" for="s"><?php _x( 'Search for:', 'label' ); ?></label>
<input type="text" value="<?php echo get_search_query(); ?>" name="s" id="s" />
<input type="submit" id="searchsubmit"
value="<?php echo esc_attr_x( 'Search', 'submit button' ); ?>" />
</div>
</form>
custom search form
<form role="search" method="get" class="search-form" action="<?php echo home_url( '/' ); ?>">
<label>
<span class="screen-reader-text"><?php echo _x( 'Search for:', 'label' ) ?></span>
<input type="search" class="search-field"
placeholder="<?php echo esc_attr_x( 'Search …', 'placeholder' ) ?>"
value="<?php echo get_search_query() ?>" name="s"
title="<?php echo esc_attr_x( 'Search for:', 'label' ) ?>" />
</label>
<input type="submit" class="search-submit"
value="<?php echo esc_attr_x( 'Search', 'submit button' ) ?>" />
</form>
