main { max-width:1200px; }

.topography-frame {
  display:block; width:100%; height:78vh; min-height:560px;
  border:1px solid #c9c0ae; background:#efece4;
  box-shadow:0 1px 6px rgba(60,45,30,.18);
}

@media (max-width:640px) {
  .topography-frame { height:72vh; min-height:520px; }
}