title: Auto popup with close button using html, CSS
body: <p>Hi I have code which generates a popup on button click.
  But can any one please modify my code so that I can insert that code in my page and  get an auto popup on my page load.</p>
  
  <p>I wish to insert this code in success page of project which appears after completion of a form.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.box {
    width: 20%;
    margin: 0 auto;
    background: rgba(255,255,255,0.2);
    padding: 35px;
    border: 2px solid #fff;
    border-radius: 20px/50px;
    background-clip: padding-box;
    text-align: center;
  }
  
  .button {
    font-size: 1em;
    padding: 10px;
    color: #fff;
    border: 2px solid orange;
    border-radius: 20px/50px;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease-out;
  }
  .button:hover {
    background: orange;
  }
  
  .overlay {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    transition: opacity 500ms;
    visibility: hidden;
    opacity: 0;
  }
  .overlay:target {
    visibility: visible;
    opacity: 1;
  }
  
  .popup {
    margin: 70px auto;
    padding: 20px;
    background: #fff;
    border-radius: 5px;
    width: 30%;
    position: relative;
    transition: all 5s ease-in-out;
  }
  
  .popup h2 {
    margin-top: 0;
    color: #333;
    font-family: Tahoma, Arial, sans-serif;
  }
  .popup .close {
    position: absolute;
    top: 20px;
    right: 30px;
    transition: all 200ms;
    font-size: 30px;
    font-weight: bold;
    text-decoration: none;
    color: #333;
  }
  .popup .close:hover {
    color: orange;
  }
  .popup .content {
    max-height: 30%;
    overflow: auto;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="box"&gt;
   &lt;a class="button" href="#popup1"&gt;Let me Pop up&lt;/a&gt;
  &lt;/div&gt;
  
  &lt;div id="popup1" class="overlay"&gt;
   &lt;div class="popup"&gt;
    &lt;h2&gt;Here i am&lt;/h2&gt;
    &lt;a class="close" href="#"&gt;×&lt;/a&gt;
    &lt;div class="content"&gt;
     Thank to pop me out of that button, but now i'm done so you can close this window.
    &lt;/div&gt;
   &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>