<body>
  <div class="container">
    <h1>Same height columns in Bootstrap</h1>
    <div class="row row-flex">
      <div class="col-md-4 col-sm-6 col-xs-12">
        <div class="content colour-1">
          <h3>First column</h3>
          <p>This one has a bit longer content</p>
          <p>This one has a bit longer content</p>
        </div>
      </div>
      <div class="col-md-4 col-sm-6 col-xs-12">
        <div class="content colour-2">
          <h3>Second column</h3>
          <p>Normal content.</p>
        </div>
      </div>
      <div class="col-md-4 col-sm-6 col-xs-12">
        <div class="content colour-3">
          <h3>Third column</h3>
          <p>Normal content.</p>
        </div>
      </div>
      <div class="col-md-4 col-sm-6 col-xs-12">
        <div class="content colour-4">
          <h3>Fourth column</h3>
          <p>Normal content.</p>
        </div>
      </div>
      <div class="col-md-4 col-sm-6 col-xs-12">
        <div class="content colour-5">
          <h3>Fifth column</h3>
          <p>Normal content.</p>
        </div>
      </div>
      <div class="col-md-4 col-sm-6 col-xs-12">
        <div class="content colour-6">
          <h3>Sixth column</h3>
          <p>Normal content.</p>
        </div>
      </div>
    </div>
    
    <p class="text-muted">This pen is a part of the <a href="https://bootstrapious.com/p/bootstrap-tips-and-tricks" target="_blank">Bootstrap tips and tricks article</a>.</p>
    
  </div>
</body>
/* display this row with flex and use wrap (= respect columns' widths) */

.row-flex {
  display: flex;
  flex-wrap: wrap;
}


/* vertical spacing between columns */

[class*="col-"] {
  margin-bottom: 30px;
}

.content {
  height: 100%;
  padding: 20px 20px 10px;
  color: #fff;
}


/* Demo backgrounds and styling*/

.colour-1 {
  background: #483C46;
  color: #fff;
}

.colour-2 {
  background: #3C6E71;
}

.colour-3 {
  background: #70AE6E;
}

.colour-4 {
  background: #82204A;
}

.colour-5 {
  background: #558C8C;
}

.colour-6 {
  background: #917C78;
}

body {
  padding: 20px 0;
  font-family: Roboto, sans-serif;
}

.content h3 {
  margin-top: 0px;
  font-weight: 300;
}

h1 {
  font-weight: 300;
  margin-bottom: 40px;
}
Rerun