JSFiddle - React, Tailwind, and code Playground

HTML

<!--How do I center the 2 childClass divs inside the parentClass div?-->
<div class="parentClass">
  <div class="childClass">
    <div class="insideChildDiv1">George</div>
    <div class="insideChildDiv2"></div>
    <div class="insideChildDiv3">CEO</div>
  </div>
  <div class="childClass">
    <div class="insideChildDiv1">John</div>
    <div class="insideChildDiv2"></div>
    <div class="insideChildDiv3">Vice President</div>
  </div>
  <div class="childClass">
    <div class="insideChildDiv1">John</div>
    <div class="insideChildDiv2"></div>
    <div class="insideChildDiv3">Vice President</div>
  </div>
  <div class="childClass">
    <div class="insideChildDiv1">John</div>
    <div class="insideChildDiv2"></div>
    <div class="insideChildDiv3">Vice President</div>
  </div>
  <div class="childClass">
    <div class="insideChildDiv1">John</div>
    <div class="insideChildDiv2"></div>
    <div class="insideChildDiv3">Vice President</div>
  </div>
</div>

CSS

.parentClass {
    width: 620px;
    background-color: gray;
    display: flex;
    justify-content: center;
    margin: auto;
    flex-wrap:wrap;
}

.childClass {
    width: 200px;
    height: 400px;
    background-color: white;
    position: relative;
    margin: 3px;
}

.insideChildDiv1 {
    position: absolute;
    width: 100%;
    height: 95px;
    top: 0;
    left: 0;
    background-color: black;
    color: white;
    text-align: center;
    line-height: 100px;
}

.insideChildDiv2 {
    position: absolute;
    width: 100%;
    height: 200px;
    top: 100px;
    left: 0;
    background-color: green;
}

.insideChildDiv3 {
    position: absolute;
    width: 100%;
    height: 95px;
    bottom: 0;
    left: 0;
    color: white;
    text-align: center;
    line-height: 100px;
    background-color: black;
}