
 
  .row {
  margin: 0 -15px;
}
.row:after {
  content: "";
  display: table;
  clear: both;
}
.col {
  float: left;
  width: 33.33333%;
  padding: 0 15px;
}<div class="row">
  <div class="col">
    <div class="your-blue-div">div1</div>
  </div>
  <div class="col">
    <div class="your-blue-div">div2</div>
  </div>
  <div class="col">
    <div class="your-blue-div">div3</div>
  </div>
</div>