fixed: added class in portfolio listing for better ui

blocks/portfolio-listing-section.php

@@ -2,7 +2,7 @@
     $terms = get_terms('portfolio-category');
     if ($terms) :
 ?>
-        <section class="background-dark mb-60 ABOUT TOP-BANNER-SECTION">
+        <section class="case-study-filter background-dark mb-60 ABOUT TOP-BANNER-SECTION">
             <div class="container">
                 <div class="row">
                     <ul class="nav nav-pills mb-3" id="pills-tab" role="tablist">