* {
  box-sizing: border-box;
}

body 
{
  background-color: #f1f1f1;
  font-family: Arial;
}

/* Center website */
.main {
  max-width: 1000px;
  margin: auto;
}


/* Add padding BETWEEN each column */


/* Create three equal columns that floats next to each other */
.column 
{
  float: left;
  display: none; /* Hide all elements by default */
}

/* 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;
}

.btn:hover {
  background-color: #ddd;
}

.btn.active {
  background-color: #666;
  color: white;
}