JSFiddle - React, Tailwind, and code Playground

by WORKMAN

HTML

<div class="section group">
  <div class="col span_1_of_3">
     1
  </div>
  <div class="col span_1_of_3">
     2
  </div>
  <div class="col span_1_of_3">
     3
  </div>
</div>

CSS

/*  COLUMN SETUP  */

.col {
  display: block;
  float: left;
  margin: 1% 0 1% 1%;
  background: #ddd;
  text-align: center;
  padding: 8px;
}

.col:first-child {
  margin-left: 0;
}

/*  GROUPING  */

.group:before,
.group:after {
  content: "";
  display: table;
}

.group:after {
  clear: both;
}

.group {
  zoom: 1;
  /* For IE 6/7 */
}

/*  GRID OF THREE  */

.span_3_of_3 {
  width: 100%;
}

.span_2_of_3 {
  width: 66%;
}

.span_1_of_3 {
  width: 32%;
}

/*  GO FULL WIDTH BELOW 480 PIXELS */

@media only screen and (max-width: 480px) {
  .col {
    margin: 1% 0 1% 0%;
  }
  .span_3_of_3,
  .span_2_of_3,
  .span_1_of_3 {
    width: 100%;
  }
}