#epaper-container {
  position: relative;
  max-width: 800px;
  margin: auto;
}

#epaper-container img {
  width: 100%;
}

.article-box {
  position: absolute;
  border: 2px solid red;
  cursor: pointer;
}

#popup {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.7);
}

.hidden {
  display: none;
}

.popup-content {
  background: white;
  padding: 20px;
  margin: 100px auto;
  width: 300px;
}