JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="root">
  <li><a href="/office-supplies/adhesive-tapes">Adhesive Tapes</a>
    <ul>
      <li><a href="/office-supplies/adhesive-tapes/brown-tapes">Brown Tapes</a></li>
      <li><a href="/office-supplies/adhesive-tapes/cellulose-vine-tapes">Cellulose Vine Tapes</a></li>
      <li><a href="/office-supplies/adhesive-tapes/clear-tapes">Clear Tapes</a></li>
      <li><a href="/office-supplies/adhesive-tapes/cloth-duct-tapes">Cloth &amp; Duct Tapes</a></li>
      <li><a href="/office-supplies/adhesive-tapes/double-sided-tapes">Double Sided Tapes</a></li>
      <li><a href="/office-supplies/adhesive-tapes/heavy-duty-tapes">Heavy Duty Tapes</a></li>
      <li><a href="/office-supplies/adhesive-tapes/invisible-tapes">Invisible Tapes</a></li>
      <li><a href="/office-supplies/adhesive-tapes/masking-tapes">Masking Tapes</a></li>
      <li><a href="/office-supplies/adhesive-tapes/mounting-tapes">Mounting Tapes</a></li>
      <li><a href="/office-supplies/adhesive-tapes/packaging-tapes">Packaging Tapes</a></li>
      <li><a href="/office-supplies/adhesive-tapes/printed-tapes">Printed Tapes</a></li>
      <li><a href="/office-supplies/adhesive-tapes/rubber-backed-tapes">Rubber Backed Tapes</a></li>
      <li><a href="/office-supplies/adhesive-tapes/tape-dispensers">Tape Dispensers</a></li>
      <li><a href="/office-supplies/adhesive-tapes/transparent-tapes">Transparent Tapes</a></li>
      <li><a href="/office-supplies/adhesive-tapes/utility-tapes">Utility Tapes</a></li>
    </ul>
  </li>
  <li><a href="/office-supplies/adhesives-2">Adhesives</a>
    <ul>
      <li><a href="/office-supplies/adhesives-2/super-glues">Super Glues</a></li>
    </ul>
  </li>
  <li><a href="/office-supplies/binder-folder-refills">Binder &amp; Folder Refills</a>
    <ul>
      <li><a href="/office-supplies/binder-folder-refills/binder-pockets-wallets">Binder Pockets &amp; Wallets</a></li>
      <li><a href="/office-supplies/binder-folder-refills/cddvd-pockets">CD/DVD Pockets</a></li>
    ...

CSS

ul#root {
  list-style-type: none;
  /*display: grid;
  grid-template-columns: 1fr 1fr 1fr;*/
  column-count: 3;
}

ul#root li {
  position: relative;
}

ul#root li:hover ul {
  visibility: visible;
}

ul#root li>ul {
  top: -12px;
  left: 190px;
  position: absolute;
  display: inline-block;
  break-inside: avoid; 
  page-break-inside: avoid;  
  will-change: transform; 
  visibility: hidden;
  z-index: 1;
  background: #ffffff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
  list-style: none;
  width: 190px;
  padding: 10px 0;
  font-size: 14px;
  line-height: 16px;
  letter-spacing: .02em;
}