JSFiddle - React, Tailwind, and code Playground

HTML

<div style="overflow: hidden; width: 100%; margin: -1.6rem 0 0 0;">
									<div class="main-content">
										
												<div class="maxh" style="overflow: hidden !important;">
<div class="minhold">
  <div class="block" style="overflow: hidden; float: left; background: #009900; height: 150px;">
    BOX 1
  </div>
    <div class="block" style="overflow: hidden; float: left; background: #990000; height: 150px;">
    BOX 2
  </div>
    <div class="block" style="overflow: hidden; float: left; background: #000099; height: 150px;">
    BOX 3
  </div>
    <div class="block" style="overflow: hidden; float: left; background: #999; height: 150px;">
    BOX 4
  </div>
</div>
</div>
</div>

CSS

* {
  padding: 0;
  margin: 0;
}

body {
  padding: 2%;
  background: #0000CC;
  color: #FFF !important;
}
.block {
  display: inline-block;
  width: 25%;
}
.minhold {
      z-index: 10;
    background-color: #ffffff;
    padding: 0 !important;
    border-radius: 4px;
    -moz-border-radius: 4px;
    border: 1px solid #ddd;
    margin-top: 6px;
    margin-left: 0.4%;
    -webkit-box-shadow: 0 6px 12px rgba(0,0,0,.175);
    box-shadow: 0 6px 12px rgba(0,0,0,.175);
    -moz-box-shadow: 0 6px 12px rgba(0,0,0,.175);
    background-clip: padding-box;
    opacity: 0.97;
    filter: alpha(opacity=97);
    width: 99%;
    float: left;
}
.dmaxh {
    overflow: hidden;
    width: 31%;
    float: left;
    margin: 0 1% 10px 1%;
}
.main-content {
    position: relative;
    z-index: 10;
    background: rgb(71, 194, 243);
    padding: 5px 5px 10px 5px;
    border-radius: 15px;
    border-top-left-radius: 0;
}