.overlay { 
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.7);
  transition: opacity 500ms;
  visibility: hidden;
  opacity: 0;
}

.overlay:target{
  visibility: visible;
  opacity: 1;
}

#popupBody{
width: 46%;
padding: 2%;
border-radius: 15px;
box-shadow: 0 0 5px #CCC;
background: #FFF;
position: relative;
margin: 20% auto;
transition: all 5s ease-in-out;	
}

#cerrar{
position: absolute;
top: 20px;
right: 30px;
font-size: 30px;
font-weight: bold;
text-decoration: none;
color: #F00;
transition: all 200ms;
}