Example of How to Create a Modal Dialog Box with CSS and JavaScript

Source Code: (back to article)

<!DOCTYPE html>
<html>
  <head>
    <title>Title of the document</title>
    <style>
      body {
        height: 100%;
        margin: 0;
        padding: 0;
        font-family: Arial, Helvetica, sans-serif;
      }
      h2 {
        font-size: 20px;
        color: #000000;
      }
      #example {
        visibility: hidden;
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        text-align: center;
        z-index: 1000;
      }
      #example div {
        width: 350px;
        height: 80px;
        margin: 100px auto;
        background-color: #f2f2f2;
        border-radius: 10px;
        -webkit-border-radius: 10px;
        -moz-border-radius: 10px;
        border: 1px solid #666666;
        padding: 15px;
        text-align: center;
        font-weight: bold;
        font-size: 15px;
        border: 3px solid #cccccc;
        position: absolute;
        left: 50%;
        top: 100px;
        transform: translate(-50%, -50%);
        -ms-transform: translate(-50%, -50%);
        -webkit-transform: translate(-50%, -50%);
      }
    </style>
  </head>
  <body>
    <h2>Create Modal Box</h2>
    <a href='#' onclick='example()'>open</a>
    <div id="example">
      <div>
        <p>Content you want the user to see goes here.</p>
        <a href='#' onclick='example()'>Click here to close the box</a>
      </div>
      <script>
        function example() {
          el = document.getElementById("example");
          el.style.visibility = (el.style.visibility == "visible") ? "hidden" : "visible";
        }
      </script>
    </div>
  </body>
</html>