CSS3 Dialog

<a href="#dialog-1">Open dialog!</a>

<div class="dialog" id="dialog-1">

  <h2>Dialog Title<a class="close" href="#closed">&#215;</a></h2>

  <section class="dialog-content">

    <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat?</p>

  </section>

  <footer class="dialog-footer">

    <a href="#">OK</a> <a href="#">Cancel</a>

  </footer>

</div>

<div class="dialog-overlay"></div>

.dialog {

  width:400px;

  height:200px;

  padding:2px 2px;

  position:absolute;

  top:50%;

  left:50%;

  z-index:999;

  margin:-123px 0 0 -203px;

  background-color:white;

  border:1px solid #ccc;

  border-radius:3px;

  box-shadow:0 1px 3px rgba(0,0,0,.4);

  font:normal normal 11px/1.4 Tahoma,Geneva,Arial,Sans-Serif;

  color:#444;

  visibility:hidden;

  opacity:0;

  transition:all .2s ease-out;

}

.dialog-overlay {

  background-color:rgba(0,0,0,.4);

  position:fixed;

  top:0;

  right:0;

  bottom:0;

  left:0;

  z-index:99;

  visibility:hidden;

  opacity:0;

  transition:opacity .2s ease-out;

}

.dialog h2 {

  margin:0 0;

  padding:0 0;

  font:normal bold 14px/30px 'Trebuchet MS',Trebuchet,Geneva,Arial,Sans-Serif;

  padding:0 15px;

  color:#D8FFEA;

  text-shadow:0 1px 0 rgba(0,0,0,.4);

  background-color:#028541;

  background-image:linear-gradient(top,#028541,#05763B);

  position:relative;

}

.dialog .close {

  display:block;

  position:absolute;

  top:5px;

  right:12px;

  line-height:normal;

  color:white;

  text-decoration:none;

  text-shadow:none;

}

.dialog .dialog-content {

  margin:15px 15px 0;

  height:114px;

}

.dialog .dialog-footer {

  height:40px;

  line-height:40px;

  border-top:1px solid #ccc;

  background-color:#eee;

  text-align:right;

  padding:0 10px 0 15px;

}

.dialog .dialog-footer a {

  display:inline-block;

  line-height:20px;

  margin:8px 2px 0 0;

  background-color:#04783B;

  border:2px solid #ccc;

  padding:0 10px;

  font-weight:bold;

  font-family:Arial,Sans-Serif;

  color:white;

  text-decoration:none;

}

.dialog .dialog-footer a:hover {background-color:#893140}

.dialog .dialog-footer a:active {background-color:#712936}

.dialog:target {

  visibility:visible;

  margin-top:-100px;

  opacity:1;

}

.dialog:target + .dialog-overlay {

  visibility:visible;

  opacity:1;

}