.slides-view,
.book-section-view{
  width:min(100%,860px);
  margin:2rem auto;
  padding:1.25rem;
  border:1px solid #d7e7e9;
  border-radius:8px;
  background:#fff;
  box-shadow:0 12px 32px rgba(16,84,104,.1);
}
.slides-view h4,
.book-section-view h4{
  margin:0 0 1rem;
  color:var(--ink);
  font:900 1.1rem "Nunito",sans-serif;
  text-align:center;
}
.slides-frame,
.book-section-frame{
  position:relative;
  width:100%;
  aspect-ratio:4/3;
  overflow:hidden;
  background:#17262b;
  border-radius:5px;
}
.slides-frame iframe,
.book-section-frame iframe{
  position:absolute;
  inset:0;
  display:block;
  width:100% !important;
  height:100% !important;
  border:0;
}
@media(max-width:600px){
  .slides-view,.book-section-view{margin:1.25rem auto;padding:.65rem}
  .slides-view h4,.book-section-view h4{text-align:left;font-size:1rem}
}