Banner code in main.php is not working with original code, there is no need to modify css file...:
Search for:
<?php if(eps_banner('home_top') !== false) { ?>
<div class="container banner-box<?php if(eps_is_demo()) { ?> is-demo<?php } ?>"><div class="inside"><?php echo eps_banner('home_top'); ?></div></div>
<?php } ?>
Easily change it to:
<div class="inside"><?php echo eps_banner('home_top'); ?></div>
Do the trick, same with banner middle
<?php if(eps_banner('home_middle') !== false) { ?>
<div class="container banner-box<?php if(eps_is_demo()) { ?> is-demo<?php } ?>"><div class="inside"><?php echo eps_banner('home_middle'); ?></div></div>
<?php } ?>
TO:
<div class="inside"><?php echo eps_banner('home_middle'); ?></div>