.row {
  margin: 8px -16px;
}

/* Add padding BETWEEN each column (if you want) */
.row,
.row > .column {
  padding: 8px;
}

/* Create three equal columns that floats next to each other */
.column {
  float: left;
  width: calc(100% / 3); 
  display: none; /* Hide columns by default */
}

.imgGallery {
  width:100%; 
  height:100%;
  padding: 5px;
  border-radius: 15px;   
}

/* Clear floats after rows */
.row:after {
  content: "";
  display: table;
  clear: both;
}

/* Content */
.content {
  background-color: white;
  padding: 10px;
}

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

/* Style the buttons */
.btn {
  border: none;
  outline: none;
  padding: 12px 16px;
  background-color: white;
  cursor: pointer;
  margin: 4px;
}

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

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