h1 {
  text-align: center;
  font-size: 80px;
  margin-top: 40px;
}
body {
  background-color: black;
  color: purple;
  font-family: Verdana;
}
.center{
 text-align: center; 
}


.hidden {
  display: none;
  }
  
.shown {
  display: block;
  padding: 30px;

  background: #010101;
  border: 0px solid #0a0a0a;
  cursor: pointer;
}

.shown:hover {
  border: 6px solid #0a0a0a;
  background: #0f0f0f;
}

.main {
  background: #000;
  display: flex;
  justify-content: center;
  align-items: center;
}

.unselectable {
   -moz-user-select: -moz-none;
   -khtml-user-select: none;
   -webkit-user-select: none;


   -ms-user-select: none;
   user-select: none;
}