/*
  https://developer.mozilla.org/en-US/docs/Web/CSS/How_to/Layout_cookbook/Sticky_footers
*/

html, body {
  height: 100vh;
}

html, body, .wrapper {
  min-height: 100%;
}

.wrapper {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-areas: "header" "main" "footer";
  grid-template-rows: auto 1fr auto;
  header {
    grid-area: header;
  }
  main {
    grid-area: main;
    display: block;
  }
  footer {
    grid-area: footer;
  }
}