.tbox {
  display: table;
  width: 100%;
  height: 100%;
  border-spacing: 0;
  table-layout: fixed;

  >.tcol {
    display: table-cell;
    float: none;
    height: 100%;
    vertical-align: top;
  }
}

@media only screen and (max-width: 992px) {
  .tbox-sm {
    display: block;

    >.tcol {
      display: block;
      width: auto;
      height: auto;
    }
  }
}

@media only screen and (max-width: 768px) {
  .tbox-xs {
    display: block;

    >.tcol {
      display: block;
      width: auto;
      height: auto;
    }
  }
}