<h1>Css Modal</h1>
  <a href="#popUp" id="openPopUp">Open it!</a>
  
<!-- POP UP -->
<aside id="popUp" class="popup">
    <div class="popUpContainer">
       <header>
        <a href="#!" class="closePopUp">X</a>
        <h2>Nicee!</h2>
       </header>
      <article>
        
      </article>
   </div>        
   <a href="#!" class="closePopUpOutSide"></a>    
</aside>

body{
  background-color: #2c3e50;  
  font-family: 'Helvetica';
  width:100%;
  height:100%;
  margin:0;
  padding: 0;
  padding-top: 10em;
  position: relative;
  text-align:center;
}
h1{
  color: #ffffff;
  padding: 1em;
}
#openPopUp{
  text-align:center;
  background-color: #1abc9c;
  padding: 15px 15px;
  color: #ffffff;
  font-weight: 500;
  font-size: 1.5em;
  border-radius: 3.5px;
  text-decoration: none;
  font-weight: 100;
  transition:background-color 0.15s linear;
  -webkit-transition:background-color 0.15s linear;
  -moz-transition:background-color 0.25s linear;
  -o-transition:background-color 0.25s linear;
}
a#openPopUp:hover{
  cursor: pointer;
  background-color: #1abc9e;
}
.popup{
  position: fixed;
  top: -100vh;
  left: 0;
  z-index: 9999999;
  background: rgba(0,0,0, 0.75);
  width: 100vw;
  height: 100vh;
  opacity: 0;

    -webkit-transition: opacity  0.35s ease;
    -moz-transition: opacity 0.35s ease;
    -o-transition: opacity 0.35s ease;
    transition: opacity 0.35s ease;
}
.popup .popUpContainer{
  width: 100%;
  max-width: 500px;
  position: fixed; /* To avoid scroll to target */
  left: 50%;
  top: -100vh;
    -webkit-transition: top  0.35s ease;
    -moz-transition: top 0.35s ease;
    -o-transition: top 0.35s ease;
    transition: top 0.35s ease;

  /* Trick to properly center the element by using negative 
  1/2 length of element as margin left and top */
  margin-left: -250px;
  background-color: #ffffff;
  -webkit-box-shadow: 0 1px 2px rgba(0,0,0,0.1);
  -moz-box-shadow: 0 1px 2px rgba(0,0,0,0.1);
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
  border-radius: 2px;
  z-index: 9999999; 
}
.popup h2{
  padding: 0.5em;
  text-align: center;
  color: #444444;
  margin: 0;
}
.popup img{
  width: 100%;
  display: block;
}
.popup article{
  height: 300px;
  background-color: #e67e22;
}
/* The cancel button on popup dialog */
.popup a.closePopUp{
  font-family: verdana;
  color: #e74c3c;
  position: absolute;
  top: 0.2em;
  right: 0.375em;
  margin: 0;
  padding: 5px;
  font-weight: bold;
  font-size: 1.5em;
  text-decoration: none;
}
/* The cancel button on popup dialog */
.popup a:hover{
  color: #c0392b;
}
/* When popup is targeted, by clicking on link with #popup in HTML */
.popup:target{
  opacity: 1;
  top: 0;
}
.popup .closePopUpOutSide{
  position: absolute;
  left:0;
  width: 100%;
  height: 100%;
  z-index: 9999991; 
}
.popup:target .popUpContainer{
  top: 50px;
    -webkit-transition: top  0.35s ease;
    -moz-transition: top 0.35s ease;
    -o-transition: top 0.35s ease;
    transition: top 0.35s ease;
}

@media  (max-width: 796px) {
  .popup .popUpContainer{
    width: 90%;
    max-width: none;
    left: 5%;
    margin-left: 0;
  }
  .popup ul{
    padding: 0 1em 0 1em;
  }
  .popup:target .popUpContainer{
    top: 25px;
    -webkit-transition: top  0.35s ease;
    -moz-transition: top 0.35s ease;
    -o-transition: top 0.35s ease;
    transition: top 0.35s ease;
  }
}

External CSS

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