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 style="background: #009900;">
            BOX 1
          </div>
            <div style="background: #990000; left:50%;">
            BOX 2
          </div>
            <div style="background: #000099; left:100%;">
            BOX 3
          </div>
            <div style="background: #999; left:150%;">
            BOX 4
          </div>
        </div>
     </div>
  </div>
</div>

CSS

* {
  padding: 0;
  margin: 0;
}

body {
  padding: 2%;
  background: #0000CC;
  color: #FFF !important;
}

.minhold {
  position:relative;
  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%;
  height:150px;
  float: left;
  overflow:auto;
}
.minhold div{
  position:absolute;
  float:left;
  width:50%;
  margin-right:-5px;
  height: 150px;
}
.maxh {
  width:99%;
  overflow: auto;
  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;
  overflow:auto;