.topbar { gap: 8px; }
.science-back {
  margin-left: auto;
  flex: 0 0 auto;
  padding: 6px 9px;
  border: 1px solid rgba(23, 24, 26, .16);
  border-radius: 6px;
  color: #9b461e;
  background: rgba(255, 255, 255, .55);
  font-size: 10px;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}
.science-back:hover, .science-back:focus-visible {
  border-color: #ba572e;
  background: #fff8ef;
  color: #642c13;
}
.science-back:focus-visible { outline: 2px solid #ba572e; outline-offset: 2px; }
@media (max-width: 520px) {
  .topbar { padding-inline: 12px; }
  .science-back { padding-inline: 6px; font-size: 9px; }
}