Модальное окно

by NMitra

HTML

<div id="raz">
    <span>кнопка</span>
    <div>содержимое</div>
</div>

CSS

#raz {
  visibility: hidden;
}

#raz span {
  visibility: visible;
}

#raz:hover {
  visibility: visible;
}

#raz div {
  position: fixed;
  z-index: 10;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  width: 20%;
  height: 20%;
  margin: auto;
  box-shadow: 0 0 20px #000, 0 0 0 1000px rgba(210,210,210,.4);
}