/* 30px white gutter between spreads */
.stf__item {
  margin-right: 30px !important;
  background: #ffffff;
}
/* hide last margin on rightmost page */
.stf__item:last-child { margin-right: 0!important; }

/* Fullscreen toolbar */
#flipper-toolbar {
  position: fixed;
  top: 10px;
  right: 10px;
  z-index: 9999;
  display: none;
}
#flipper-toolbar button{
  margin:0 4px;
  padding:6px 10px;
  font-size:16px;
}

/* Single‑page mode hides gutter */
#flipbookContainer.flipper-single .stf__item {
  margin-right: 0 !important;
}