JSFiddle - React, Tailwind, and code Playground

HTML

<div class="row">
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
</div>
<div class="alt-row">
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
</div>
<div class="row">
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
</div>
<div class="alt-row">
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
  <span class="hex"></span>
</div>

CSS

.row {
  padding-top:29px;
}

.row ~ .row {
  padding-top:0px;
}

.alt-row {
  margin-left: 52px;
}

.hex:before {
    content: " ";
    width: 0; height: 0;
    border-bottom: 30px solid #6C6;
    border-left: 52px solid transparent;
    border-right: 52px solid transparent;
    position: absolute;
    top: -30px;
}

.hex {
    margin-top: 1px;
    width: 104px;
    height: 60px;
    background-color: #6C6;
    position: relative;
    float:left;
    margin-bottom:30px;
    margin-right:1px;
}

.hex:after {
    content: "";
    width: 0;
    position: absolute;
    bottom: -30px;
    border-top: 30px solid #6C6;
    border-left: 52px solid transparent;
    border-right: 52px solid transparent;
}