html,
body {
  max-width: 100%;
  overflow-x: hidden;
}

.card,
.row > * {
  min-width: 0;
}

img,
svg {
  max-width: 100%;
}

@media (max-width: 600px) {
  header {
    align-items: stretch;
    flex-wrap: wrap;
    padding: .55rem;
  }

  header b {
    flex-basis: 100%;
  }

  header input {
    flex: 1;
    min-width: 7rem;
    width: auto;
  }

  main {
    padding: .65rem;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .row > label,
  .row > input,
  .row > select,
  .row > button {
    width: 100%;
  }
}