.slick-header-checkbox {
  display: inline-block;
  float: left;
  vertical-align: top;
  margin: 1px;
  /**
  * This makes all "float:right" elements after it that spill over to the next line
  * display way below the lower boundary of the column thus hiding them.
  */
  margin-bottom: 100px;
  height: 15px;
  width: 15px;
  background-repeat: no-repeat;
  background-position: center center;
/*   cursor: pointer; */
}

.slick-header-checkbox-hidden {
  width: 0;
  display :none;
  -webkit-transition: 0.2s width;
  -ms-transition: 0.2s width;
  transition: 0.2s width;
}

.slick-header-column:hover > .slick-header-checkbox {
  width: 15px;
  display: inline-block;
}