.work-mail-shell {
  width: 100%;
  min-width: 0;
  min-height: calc(100vh - 120px);
}
.work-mail-frame {
  display: block;
  width: 100%;
  height: max(740px, calc(100dvh - 130px));
  border: 0;
  border-radius: 10px;
  background: #fff;
}
@media (max-width: 760px) {
  .work-mail-shell { min-height: calc(100dvh - 100px); }
  .work-mail-frame { height: max(650px, calc(100dvh - 105px)); }
}