sticky footer

/* Use flex and set auto margin */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

footer {
  margin-top: auto;
}

html, body {
  height: 100%;
}
body {
  display: flex;
  flex-direction: column;
}
.content {
  flex: 1 0 auto;
}
.footer {
  flex-shrink: 0;
}