<form role="search" method="get" class="search-form" action="<?php bloginfo('url'); ?>/">
    <input type="search" id="search-input" class="search-input" 
           placeholder="Enter your search term..." 
           value="<?php the_search_query(); ?>" name="s" aria-label="Search">
    <button type="submit" class="search-button">Search</button>
</form>