Problems rollover doesnt work anymore

After updating Top Widgets I - text rollover doesnt work anymore on banner see the link knjizarapismo.com:
<div class="gk-banner">
<h2><a href="?product_cat=udzbenici">Udžbenici</a></h2>
<strong><a href="?product_cat=udzbenici">Pogledajte kolekciju</a></strong>
<a href="?product_cat=udzbenici"><img src="[pageurl]/wp-content/uploads/2017/02/benner-book-category-red.png" alt=""></a>
</div>
Other banner works but if i update rollover will not work anymore and text CSS i am using updated wordpress 4.8

I found a problem but i dont know why after updating text widget WordPress automatically adds <br> and <p> tags when i save banner. How to remove that

Hi,
It's a problem with new text widget introduced in last version of WordPress, please check the solution here:
https://www.gavick.com/forums/john-wp/c ... dget-54227

I just added a Claasic Widget Style but then i widget rules i dont have all Widget Styles: in drop down Banner Advertisement, also Top Bar widget social icons doesnt have roll over effects and everything is in onle line on the left

Dear Joshua i find the solution and now inStyle work with 4.8 text widget the only thing is to add this line of code in /wp-includes/formatting.php:
remove_filter('widget_text_content', 'wpautop');
I hope that this will help all and i am happy to share with you as Joshua help us all this years

Thanks for the solution, but please remember that editing WordPress core files is not recommended. Try to add this code into your theme functions.php file.