JSFiddle - React, Tailwind, and code Playground

by B L Praveen

HTML

<div class="gbtr_first_menu_inside">
   <ul class="" id="menu">
      <li class="menu-item menu-item-type-taxonomy menu-item-object-product_cat current-product_cat-ancestor current-menu-ancestor current-menu-parent current-product_cat-parent menu-item-has-children menu-item-649">
         <a href="/?product_cat=clothing" class="sf-with-ul">Clothing<span class=""> »</span></a>
          <div id="mega">
         <ul class="sub-menu" style="">
            <li class="menu-item menu-item-type-taxonomy menu-item-object-product_cat current-menu-item menu-item-has-children menu-item-177">
               <a href="/?product_cat=ab-ayas" class="sf-with-ul">Abayas<span class=""> »</span></a>
               <ul class="sub-menu" style="">
                  <li class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-178"><a href="/?product_cat=iffah-collection">IFFAH Collection</a></li>
                  <li class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-179"><a href="/?product_cat=muslimkart-collection">Muslimkart Collection</a></li>
               </ul>
            </li>
            <li class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-180"><a href="/?product_cat=hijabs">Hijabs</a></li>
            <li class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-has-children menu-item-175">
               <a href="/?product_cat=accessories" class="sf-with-ul">Accessories<span class=""> »</span></a>
               <ul class="sub-menu" style="">
                  <li class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-176"><a href="/?product_cat=plain-head-cap">Plain Head Caps</a></li>
                  <li class="menu-item menu-item-type-taxonomy menu-item-object-product_cat menu-item-654"><a href="/?product_cat=head-caps">Head Caps</a></li>
                  <li class="menu-item menu-item-type-taxonomy menu-item-object-product_cat...

CSS

ul#menu li {
  position: relative;
  display: inline-block;
}

ul#menu li a {
  display: block;
  height: 50px;
  font-size: 1em;
  line-height: 50px;
  color: #555;
  text-decoration: none;
  padding: 0 15px;
}
ul#menu li:hover > #mega {
  display: block;
}
#mega {
  position: absolute;
  top: 100%;
  left: 0;
  width: 800px;
  height: 300px;
  padding: 10px;
  background: #fff;
  display: none;
  border:1px solid #000;  
     -moz-column-count: 4;
    -moz-column-gap: 20px;
    -webkit-column-count:4;
    -webkit-column-gap: 10px;
    column-count:4;
    column-gap: 10px;   
}