html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.site-container {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.container {
  flex-grow: 1;
}

chass-footer {
  margin-top: auto;
}