#hidden {
  display: none;
  
}
:checked + #hidden {
  display: block;
}

#visible {
  display: block;
  
}
:checked + #visible {
  display: none;
}



.text-block {
	display: none;
	border: none;
	color: black;
	padding: 10px;
	text-align: center;
	text-decoration: none;
	display: inline-block;
	font-size: 14px;
	font-weight: bold;
	font-variant-caps: small-caps;
	margin: 4px 4px;
	border-radius: 30px 15px;
}
.massive {display: none; background-color: YellowGreen;}
.graph {display: none; background-color: LightGray;}
.ml {display: none; background-color: OrangeRed;}

.doc{
	display : block;	
}
.md-doc
.ga-doc
.ml-doc