Sticky menu, remove featured image from page

ok get the answer.

for hide featured image :

go to template-portfolio-item.php and remove this:

<?php if ( has_post_thumbnail( $post->ID ) ) : ?>
<div class=”featured-image single-portfolio-featured-image”>
<?php echo get_the_post_thumbnail( $post->ID, ‘thumbnail-span-10’ ); ?>
</div>
<?php endif; ?>

for menu sticky write CSS:

nav.primary-navigation {
position: fixed;
}
.welcome-screen {
background-position-y: 79px!important;
padding-top: 249px!important;
}