body {
	color: #DCDCDC;
	background: #1A1A1A;
}

a:link{
	color: #5f9EA0;
}
a:visited{
	color:#BF71D1;
}

.collapsible {
background-color: #eee;
  color: #444;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 15px;
}

.center {
	text-align: center;
	width: 100%;
	margin: auto;
	max-width: 100%;
}

.column {
	display: inline-block;
	float: left;
	width: 25%;
}

.row:after {
	content: "";
	display: table;
	clear: both;
}

@media screen and (max-width: 992px) {
	.column {
		width:50%;
}
	.column:nth-child(odd) {
		clear:both;
}
}

@media screen and (max-width: 500px) {
	.column {
	width:100%;
}
}