* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
header {
  padding: 1.5rem 1rem;
  background-color: orange;
  color: white;
}

main {
  flex-grow: 1;
  background: #eee;
  padding: 1rem;
}

footer {
  padding: 1rem;
}