fieldset {
  display: grid;
  grid-template-columns: 1fr;
  grid-gap: 5px;
}

label,
input,
button,
textarea {
  grid-column: 1 / 2;
}

@media (min-width: 30em) {
  fieldset {
    display: grid;
    grid-template-columns: 1fr 5fr;
    grid-gap: 0;
  }

  label {
    grid-column: 1 / 2;
  }

  input,
  button,
  textarea {
    grid-column: 2 / 3;
  }
}