JSFiddle - React, Tailwind, and code Playground

HTML

<div id="inventory">
  <h2>Inventory</h2>
  <ul id="inventory-items">
    <li class="inventory-item">
      <img class="invetory-pic" src="https://www.gdrc.psychol.cam.ac.uk/images/apple/image" / alt="">
      <span class="inventory-stock">1</span>
    </li>
    <li class="inventory-item">
      <img class="invetory-pic" src="https://www.gdrc.psychol.cam.ac.uk/images/apple/image" / alt="">
      <span class="inventory-stock">5</span>
    </li>
    <li class="inventory-item">
      <img class="invetory-pic" src="https://www.gdrc.psychol.cam.ac.uk/images/apple/image" / alt="">
      <span class="inventory-stock">121</span>
    </li>
    <li class="inventory-item">
      <img class="invetory-pic" src="https://www.gdrc.psychol.cam.ac.uk/images/apple/image" / alt="">
      <span class="inventory-stock">1000</span>
    </li>
    <li class="inventory-item">
      <img class="invetory-pic" src="https://www.gdrc.psychol.cam.ac.uk/images/apple/image" / alt="">
      <span class="inventory-stock">10</span>
    </li>
    <li class="inventory-item">
      <img class="invetory-pic" src="https://www.gdrc.psychol.cam.ac.uk/images/apple/image" / alt="">
      <span class="inventory-stock">5</span>
    </li>
    <li class="inventory-item">
      <img class="invetory-pic" src="https://www.gdrc.psychol.cam.ac.uk/images/apple/image" / alt="">
      <span class="inventory-stock">5</span>
    </li>
    <li class="inventory-item">
      <img class="invetory-pic" src="https://www.gdrc.psychol.cam.ac.uk/images/apple/image" / alt="">
      <span class="inventory-stock">5</span>
    </li>
  </ul>
</div>

CSS

#inventory-items {
  display: flex;
  list-style: none;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  width: 300px;
  background-color: rgba(0, 0, 0, .2);
}

.inventory-item {
  position: relative;
  border: 1px solid transparent;
}

.inventory-stock {
  position: absolute;
  bottom: 5px;
  right: 0;
  z-index: 1;
  background-color: rgba(0, 0, 0, .7);
  color: white;
  display: inline-block;
  padding: 1px 2px;
  text-align: center;
  font-size: 90%;
}

.invetory-pic {
  max-width: 50px;
}