/*--------------------------------------------------------------
Global
--------------------------------------------------------------*/
body {
	margin: 1em;
	color: black;
	font-family: "Fira Code", monospace;
	font-size: 18px;
	line-height: 1.5;
}

.masthead {
	text-align: center;
}

.interface {
  display: flex;
  justify-content: center;
}

.button {
  border: 5px solid #f44336;
  border-radius: .75em;
  padding: .7em 1.25em;
  margin: 1em .5em 0;
  font-size: 1em;
  font-weight: bold;
}

.button:focus,
.button:hover {
  background: #f44336a6;
  color: white;
}
.box-grid {
  margin: 2em;
  padding: .5em;
	border: 5px solid #41444B;
	border-radius: 15px;
}

/*--------------------------------------------------------------
Box styles
--------------------------------------------------------------*/

.box-grid li {
  list-style-type: none;
	padding: 1em;
	color: white;
	text-align: center;
	text-shadow: 1px 1px 1px #000;
	border-radius: 7px;
/*   min-height: 5em; */
}

.box-grid li:nth-child(7n+1) {
  border: 5px solid hsl(204, 63%, 45%);
	background-color: hsla(204, 63%, 45%, .5);
}

.box-grid li:nth-child(7n+2) {
	border: 5px solid hsl(283, 43%, 47%);
	background-color: hsla(283, 43%, 47%, .5);
}

.box-grid li:nth-child(7n+3) {
	border: 5px solid hsl(169, 76%, 35%);
	background-color: hsla(169, 76%, 35%, .5);
}

.box-grid li:nth-child(7n+4) {
	border: 5px solid hsl(48, 89%, 50%);
	background-color: hsla(48, 89%, 50%, .5);
}

.box-grid li:nth-child(7n+5) {
	border: 5px solid hsl(28, 80%, 52%);
	background-color: hsla(28, 80%, 52%, .5);
}

.box-grid li:nth-child(7n+6) {
	border: 5px solid hsl(5, 80%, 58%);
	background-color: hsla(5, 80%, 58%, .5);
}

.box-grid li:nth-child(7n+7) {
	border: 5px solid hsl(210, 28%, 29%);
	background-color: hsla(210, 28%, 29%, .5);
}

/* Base grid */
.box-grid {
	display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
	justify-content: center;
  align-content: center;
	grid-gap: .5em;
}

/* Two columns */
@element '.box-grid' and (min-children: 2) {
  :self {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Three items */
@element '.box-grid' and (min-children: 3) and (max-children: 3) {
  :self li:first-child {
    grid-column: 1/3;
  }
}

/* Five items */
@element '.box-grid' and (min-children: 5) and (max-children: 5) {
  :self li:first-child {
    grid-row: 1/3;
  }
}

/* Six items */
@element '.box-grid' and (min-children: 6) and (max-children: 6) {
  :self li:first-child {
    grid-row: 1/3;
  }
  :self li:last-child {
    grid-column: 2/3;  
    grid-row: 3/5;
  }
}

/* Six items */
@element '.box-grid' and (min-children: 7) and (max-children: 7) {
  :self {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(4, 5em);
  }
  :self li:first-child {
    grid-column: 1/3;
    grid-row: 1/3;
  }
  :self li:nth-child(3) {
    grid-column: 3/4;  
    grid-row: 2/4;
  }
  :self li:nth-child(5) {
    grid-column: 2/3;  
    grid-row: 3/5;
  }
}

const GRID = document.querySelector('.box-grid');
const MORE = document.querySelector('#more');
const LESS = document.querySelector('#less');
var count = 1;

function addItem() {
  let el = document.createElement("li");
  el.append('Box ' + ++count);
  GRID.append(el);
}

function removeItem() {
  let list = GRID.querySelectorAll('li');
  list[list.length - 1].remove();
  count--;
}

MORE.addEventListener('click', addItem, false);
LESS.addEventListener('click', removeItem, false);