searh box for wordpress header

dear
i have the below code added the code to my header.php file it shows the form but when i search it looks in to the blog posts or portfolio i want to search pages on the wordpress site or specific pages so it shows up the site products, items or services , how can i change the code to search the pages instead of blog or post ??

<form role=”search” method=”get” id=”searchform” action=”https://example.com/”&gt;
<div><label class=”screen-reader-text” for=”s”>Search for:</label>
<input type=”text” value=”” name=”s” id=”s” />
<input type=”submit” id=”searchsubmit” value=”Search” />
</div>
</form>