.row {
    display: -ms-flexbox; /* IE 10 */
    display: flex;
    -ms-flex-wrap: wrap; /* IE 10 */
    flex-wrap: wrap;
    padding: 0 4px;
  }
  
  /* Create two equal columns that sits next to each other */
  .column {
    -ms-flex: 30%; /* IE 10 */
    flex: 30%;
    padding: 0 4px;
  }
  
  .column img {
    margin-top: 8px;
    vertical-align: middle;
  }
  
  /* Style the buttons */
  .btn {
    border: none;
    outline: none;
    padding: 10px 16px;
    background-color: #f1f1f1;
    cursor: pointer;
    font-size: 18px;
  }
  
  .btn:hover {
    background-color: #ddd;
  }
  
  .btn.active {
    background-color: #666;
    color: white;
  }

  @media (max-width:991px)
{
     .column {
        -ms-flex: 50%; /* IE 10 */
        flex: 50%;
        padding: 0 4px;
      }
} 
@media (max-width:768px)
{
     .column {
        -ms-flex: 100%; /* IE 10 */
        flex: 100%;
        padding: 0 4px;
      }
}