container,
[container] {
  container-name: container;
}

[layout] {
  container-name: layout;
  container-type: inline-size;
}

body {
  container-name: body;
}

header {
  container-name: header;
  container-type: inline-size;
}

main {
  container-name: main;
  container-type: inline-size;
}

footer {
  container-name: footer;
  container-type: inline-size;
}