button {
  padding: 5px;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  text-align: center;
  text-decoration: none;
  vertical-align: middle;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
  background-color: transparent;
  border: 1px solid transparent;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  border-radius: 0.25rem;
  transition: color .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out;
  color: #fff;
  background-color: #6f42c1;
  border-color: rgba(52,68,91,0);
}

#reader {
  width: 85vw!important;
  height: 60vw!important;
  max-width: 450px!important;
  max-height: 450px!important;
}

#myModal .btn-close {
  display: none;
  visibility: hidden;
}