<div class="bgd">
  
  <div class="items-1">
    <a href="https://xxxxxxxxxx.com/index.php?route=product/category&amp;path=60">
      <img  src="http://lorempixel.com/400/200/">
    </a>
  </div> 

  <div class="items-2">
    <a href="https://xxxxxxxxxx.com/index.php?route=product/category&amp;path=60">
      <img  src="http://lorempixel.com/400/200/">
    </a>
  </div>

  <div class="items-3">
    <a href="https://xxxxxxxxxx.com/index.php?route=product/category&amp;path=60">
      <img  src="http://lorempixel.com/400/200/">
    </a>
  </div> 

  <div class="items-4">
    <a href="https://xxxxxxxxxx.com/index.php?route=product/category&amp;path=60">
      <img  src="http://lorempixel.com/400/200/">
    </a>
  </div> 
  
</div>

.bgd{
  width: 100%;
  position: relative;
  text-align: center
}

.bgd > *{
  display: inline-block;
  width: calc(100% / 2 - 8px);
  margin: 2px
}

.bgd > * img{
  width: 100%;
  height: auto;
  max-width: 100%
}

@media screen and (max-width: 480px) {
  .bgd > *{
    display: block;
    width: 100%;
    margin: 2px 0
  }
}