Wie kann man eine modale Dialogbox mit CSS und JavaScript erstellen

Source Code: (back to article)

<!DOCTYPE html>
<html>
  <head>
    <style>
      .modalDialog {
      position: fixed;
      font-family: Arial, Helvetica, sans-serif;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
      background: rgba(0,0,0,0.1);
      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;
      position: relative;
      margin: 10% auto;
      padding: 5px 20px 13px 20px;
      border-radius: 10px;
      background: -moz-linear-gradient(#2edbe8, #01a6b2);
      background: -webkit-linear-gradient(#2edbe8, #01a6b2);
      background: -o-linear-gradient(#2edbe8, #01a6b2);
      }
      .close {
      background: #606061;
      color: #FFFFFF;
      line-height: 25px;
      position: absolute;
      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: #6ed1d8; }
    </style>
  </head>
  <body>
    <h2>Modale Box erstellen</h2>
    <a href="#openModal">Box</a>
    <div id="openModal" class="modalDialog">
      <div>
        <a href="#close" title="Close" class="close">X</a>
        <h2>Modale Box </h2>
        <p>Diese modale Box wurde mit CSS3 erstellt.</p>
      </div>
      <a href="#close" title="Close" class="close">x</a>
    </div>
  </body>
</html>