Open header.php
and delete these lines:
<nav class="menu-wrap<?php ac_mini_disabled(); if ( get_theme_mod( 'ac_disable_stickymenu' ) ) { echo ' sticky-disabled'; } ?>" role="navigation">
<?php
if( has_nav_menu( 'main' ) ) {
wp_nav_menu( array( 'container' => '', 'theme_location' => 'main', 'items_wrap' => '<ul class="menu-main mobile-menu superfish">%3$s</ul>' ) );
} else {
echo '<ul class="menu-main mobile-menu superfish"><li class="current_page_item"><a>' . __( 'Add a menu', 'acosmin' ) . '</a></li></ul>';
}
?>
<a href="#" class="mobile-menu-button"><?php ac_icon( 'bars' ) ?></a>
<?php if ( !get_theme_mod( 'ac_disable_minisidebar' ) ) { ?>
<a href="#" class="browse-more" id="browse-more"><?php echo ac_icon('caret-down', false) . __( 'Browse', 'acosmin' ) ?></a>
<?php } ?>
<a href="#" class="search-button"><?php ac_icon( 'search' ) ?></a>
<ul class="header-social-icons clearfix">
<?php
// Social variables - Options Panel
$header_fb = of_get_option( 'ac_facebook_url' );
$header_tw = of_get_option( 'ac_twitter_username' );
$header_gp = of_get_option( 'ac_gplus_url' );
$header_rss = of_get_option( 'ac_custom_rss_url' );
?>
<?php if ( $header_tw != '' ) { ?><li><a href="https://twitter.com/<?php echo esc_html( $header_tw ); ?>" class="social-btn left twitter"><?php ac_icon('twitter'); ?></a></li><?php } ?>
<?php if ( $header_fb != '' ) { ?><li><a href="<?php echo esc_url( $header_fb ); ?>" class="social-btn right facebook"><?php ac_icon('facebook'); ?></a></li><?php } ?>
<?php if ( $header_gp != '' ) { ?><li><a href="<?php echo esc_url( $header_gp ); ?>" class="social-btn left google-plus"><?php ac_icon('google-plus'); ?></a></li><?php } ?>
<li><a href="<?php if( $header_rss != '' ) { echo esc_url( $header_rss ); } else { bloginfo( 'rss2_url' ); } ?>" class="social-btn right rss"><?php ac_icon('rss'); ?></a></li>
</ul><!-- END .header-social-icons -->
<div class="search-wrap nobs">
<form role="search" id="header-search" method="get" class="search-form" action="<?php echo esc_url( home_url( '/' ) ); ?>">
<input type="submit" class="search-submit" value="<?php _e( 'Search', 'acosmin' ); ?>" />
<div class="field-wrap">
<input type="search" class="search-field" placeholder="<?php _e( 'type your keywords ...', 'acosmin' ); ?>" value="<?php get_search_query(); ?>" name="s" title="<?php _e( 'Search for:', 'acosmin' ); ?>" />
</div>
</form>
</div><!-- END .search-wrap -->
</nav><!-- END .menu-wrap -->
Then open style.css
and find:
.top {
height: 150px;
}
Change it with:
.top {
height: 220px;
}