@font-face { font-family: Lato; src: url('lato.ttf'); } 

.window_popup {
  position: fixed;
  background-color: rgba(0,0,0,0.7);
  width: 75%;
  height: 75%;
  font-size: 17px;
  color: #ffffff;
  font-family: 'Lato', Helvetica, Arial, sans-serif;
  z-index: 100;
  text-align: justify;
  overflow-x: hidden;
  overflow-y: auto;
  padding: 80px;
}

.mask {
  position: fixed;
  width: 100%;
  height: 100%;
  z-index: 99;

  background-color: rgba(20,20,20,0.8);
}