main > article,
main > form {
  display: grid;
  grid-template-areas: "header" "content" "footer";
  grid-template-rows: min-content 1fr min-content;
  height: 100%;
}
main > article > footer,
main > form > footer {
  grid-area: footer;
}
main > article > h2, main > article > header,
main > form > h2,
main > form > header {
  grid-area: header;
}
main > article > :not(footer, h2, header),
main > form > :not(footer, h2, header) {
  display: block;
  grid-area: content;
  height: 100%;
  overflow-y: auto;
  overscroll-behavior: contain;
}

article > header > h2, form > header > h2 {
  background: #eee;
  border-bottom: 1px solid #ccc;
  font-size: inherit;
  margin: 0;
  padding: 0.5em;
}
article > p, form > p {
  margin: 0.75em;
}