style.css

h1 {
  text-align: center;
  display: block;
}

#abstract-modal .modal-block {
  position: fixed !important;
  top: 50% !important;
  left: 50% !important;
  transform: translate(-50%, -50%) !important;
  width: 80vw !important;
  max-width: 900px !important;
  margin: 0 !important;
}

#abstract-modal .modal-block,
#abstract-modal .modal-block * {
  font-size: 1.0rem !important;
}