JSFiddle - React, Tailwind, and code Playground

HTML

<ul>

  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
  <li>товар</li>
</ul>

CSS

* {
  box-sizing: border-box
}

html,
body {
  height: 100%;
  padding: 0;
  margin: 0;
}


ul {
  display: flex;
  flex-wrap: wrap;
  padding: 0;
  margin: 20px;
  list-style: none;
  border-top: 1px solid gray;
  border-left: 1px solid gray;
}
li {
  width: 33.33%;
  height: 100px;
  border-bottom: 1px solid gray;
  border-right: 1px solid gray;
}
li:hover {
  box-shadow: 0 0 0 5px #fff, 0 0 15px 0 gray;
  border: none;
  z-index: 1;
  
}