<h1>Popup/Modal Windows without JavaScript</h1>
<div id="wrapper">
  <p><a class="button" href="#popup1">Click Me</a></p>
  <p><a class="button" href="#popup2">Click Me Too</a></p>
</div>

<div id="popup1" class="overlay">
  <div class="popup">
    <h2>Info box</h2>
    <a class="close" href="#">&times;</a>
    <div class="content">
      <p>This is done totally without JavaScript. Just HTML and CSS.</p>
    </div>
  </div>
</div>

<div id="popup2" class="overlay light">
  <a class="cancel" href="#"></a>
  <div class="popup">
    <h2>What the what?</h2>
    <div class="content">
      <p>Click outside the popup to close.</p>
    </div>
  </div>
</div>

body {
  font-family: Arial, sans-serif;
  background: #ddd;
}

h1 {
  text-align: center;
  font-family: "Trebuchet MS", Tahoma, Arial, sans-serif;
  color: #333;
  text-shadow: 0 1px 0 #fff;
  margin: 50px 0;
}

#wrapper {
  width: 100px;
  margin: 0 auto;
  background: #fff;
  padding: 20px;
  border: 10px solid #aaa;
  border-radius: 15px;
  background-clip: padding-box;
  text-align: center;
}

.button {
  font-family: Helvetica, Arial, sans-serif;
  font-size: 13px;
  padding: 5px 10px;
  border: 1px solid #aaa;
  background-color: #eee;
  background-image: linear-gradient(top, #fff, #f0f0f0);
  border-radius: 2px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
  color: #666;
  text-decoration: none;
  text-shadow: 0 1px 0 #fff;
  cursor: pointer;
  transition: all 0.2s ease-out;
  &:hover {
    border-color: #999;
    box-shadow: 0 1px 3px rgba(0,0,0,0.25);
  }
  &:active {
    box-shadow: 0 1px 3px rgba(0,0,0,0.25) inset;
  }
}

.overlay {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0,0,0,0.5);
  transition: opacity 200ms;
  visibility: hidden;
  opacity: 0;
  &.light {
    background: rgba(255,255,255,0.5);
  }
  .cancel {
    position: absolute;
    width: 100%;
    height: 100%;
    cursor: default;
  }
  &:target {
    visibility: visible;
    opacity: 1;
  }
}

.popup {
  margin: 75px auto;
  padding: 20px;
  background: #fff;
  border: 1px solid #666;
  width: 300px;
  box-shadow: 0 0 50px rgba(0,0,0,0.5);
  position: relative;
  .light & {
    border-color: #aaa;
    box-shadow: 0 2px 10px rgba(0,0,0,0.25);
  }
  h2 {
    margin-top: 0;
    color: #666;
    font-family: "Trebuchet MS", Tahoma, Arial, sans-serif;
  }
  .close {
    position: absolute;
    width: 20px;
    height: 20px;
    top: 20px;
    right: 20px;
    opacity: 0.8;
    transition: all 200ms;
    font-size: 24px;
    font-weight: bold;
    text-decoration: none;
    color: #666;
    &:hover {
      opacity: 1;
    }
  }
  .content {
    max-height: 400px;
    overflow: auto;
  }
  p {
    margin: 0 0 1em;
    &:last-child {
      margin: 0;
    }
  }
}