1 - Lightbox CSS
CSS DE LA LIGHTBOX
.black_overlay{
  display: none;
  position: absolute;
  top: 0%;
  left: 0%;
  width: 100%;
  height: 100%;
  background-color: black;
  z-index:1001;
  -moz-opacity: 0.8;
  opacity:.80;
  filter: alpha(opacity=80);
}
 
.white_content {
  display: none;
  position: absolute;
  top: 25%;
  left: 25%;
  width: 50%;
  height: 50%;
  padding: 16px;
  border: 16px solid orange;
  background-color: white;
  z-index:1002;
  overflow: auto;
}



CONTENU DE LA LIGHTBOX
<div id="light" class="white_content">Hi, I am an happy lightbox</div><div id="fade" class="black_overlay"></div>

APPEL DE LA LIGHTBOX
<a href = "javascript:void(0)" onclick = "document.getElementById('light').style.display='block';document.getElementById('fade').style.display='block'">Click me</a>

LIEN POUR FERMER LA LIGHTBOX
<a href = "javascript:void(0)" onclick = "document.getElementById('light').style.display='none';document.getElementById('fade').style.display='none'">Hide me</a>