.filterDiv {
    position: relative;
    float: left;
    width: 25%;
    display: none;
}

/* The "show" class is added to the filtered elements */
.show {
    display: block;
}

/* Style the buttons */
.btnFilter {
  border: none;
  outline: none;
  padding: 12px 16px;
  background-color: #f1f1f1;
  cursor: pointer;
}

/* Add a light grey background on mouse-over */
.btnFilter:hover {
  background-color: #ddd;
}

/* Add a dark background to the active button */
.btnFilter.active {
  background-color: #666;
  color: white;
}