.pdfsmith-download-btn {
  display: inline-block;
  padding: 8px 14px;
  background:#0073aa;
  color:#fff;
  border-radius:3px;
  border:none;
  cursor:pointer;
  font-size: 14px;
}
.pdfsmith-download-btn:disabled { opacity: .6; cursor: not-allowed;}

/* Floating wrapper */
.pdfsmith-floating-wrapper {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 10000;
}
.pdfsmith-floating-wrapper .pdfsmith-download-btn {
  padding: 12px 18px;
  border-radius: 30px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}