<style type="text/css">
 .modalDialog {
  ;
  font-family: Arial, Helvetica, sans-serif;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: rgba(0,0,0,0.8);
  z-index: 99999;
  opacity:0;
  -webkit-transition: opacity 400ms ease-in;
  -moz-transition: opacity 400ms ease-in;
  transition: opacity 400ms ease-in;
  pointer-events: none;
 }
 .modalDialog:target {
  opacity:1;
  pointer-events: auto;
 }
 .modalDialog > div {
  width: 400px;
  ;
  margin: 10% auto;
  padding: 5px 20px 13px 20px;
  border-radius: 10px;
  background: #fff;
  background: -moz-linear-gradient(#fff, #999);
  background: -webkit-linear-gradient(#fff, #999);
  background: -o-linear-gradient(#fff, #999);
 }
 .close {
  background: #606061;
  color: #FFFFFF;
  line-height: 25px;
  ;
  right: -12px;
  text-align: center;
  top: -10px;
  width: 24px;
  text-decoration: none;
  font-weight: bold;
  -webkit-border-radius: 12px;
  -moz-border-radius: 12px;
  border-radius: 12px;
  -moz-box-shadow: 1px 1px 3px #000;
  -webkit-box-shadow: 1px 1px 3px #000;
  box-shadow: 1px 1px 3px #000;
 }
 .close:hover { background: #00d9ff; }

</style>

<a href="#openModal">Open Modal​​​</a> <div class="modalDialog" id="openModal"><div><a title="Close" class="close" href="#close">X</a> <h2>Modal Box</h2>