.seccion2 {
    padding: 60px 0 40px 0;
    min-height: 900px;

    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.seccion2 .container2 {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    align-items: center;
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 50px 40px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 18px;
    min-height: 507px; /* 390px + 30% = 507px */
}

.seccion2 .container2 [sub] {
    grid-column: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
}

.seccion2 .container2 [sub] h2 {
    font-size: 1.5rem;
    line-height: 1.6;
    margin: 0;
}

.seccion2 .libro1, .seccion2 .libro2 {
    display: flex;
    align-items: center;
    justify-content: center;

    border-radius: 12px;
}

.seccion2 .container2 .libro1 {
    align-self: start;
}

.seccion2 .container2 .libro2 {
    align-self: end;
}

@media (min-width: 768px) and (max-width: 1023px) {
  .seccion2 .container2 [sub] h2 {
    font-size: 1.2rem;
  }
}

@media (max-width: 767px) {
  .seccion2 .container2 [sub] h2 {
    font-size: 1.29rem;
  }
}

@media (max-width: 480px) {
  .seccion2 .container2 .libro1,
  .seccion2 .container2 .libro2 {
    display: none;
  }
  .seccion2 .container2 [sub] {
    grid-column: 1 / -1;
    width: 100%;
    justify-self: stretch;
    align-self: stretch;
  }
}