body{
  position: relative;
}

.content{
  position: relative;
}

.overlay{
  position: fixed;

  width: 100%;
  height: 100%;
  background-color: black;
  background-color: rgba(0,0,0, 0.75);
}

.popup{
  width: 100%;
  position: absolute;
  left: 50%;
  top: 50%;
  color: white;
}

.closebutton{
  position: absolute;
  top: 20px;
  right: 20px;
  text-align: right;
  color: white;
}