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

body {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

body > main {
  flex: 1 0 auto;
  margin: 0 auto;
}

.site-footer {
  width: 100%;
  flex: 0 0 auto;
  margin-top: auto;
}