JSFiddle - React, Tailwind, and code Playground

HTML

<div class="flex">
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
</div>

CSS

.flex {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
}

.item, .item1, .item2 {
  width: 150px;
  height: 150px;
  background: red;
  margin: 1px;
}

.item:nth-last-of-type(-n+2) {
   background: blue;
   margin-right: auto;
   margin-left: 7px;
   z-index: 1;
 }
 
.item:nth-last-of-type(-n+1) {
   background: green;
   margin-left: auto;
   margin-right: 7px;
   z-index: 2;
 }