Answers for "how to force footer to bottom of page"

push footer to bottom

.flex-wrapper {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  justify-content: space-between
}

footer at bottom of body

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