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

main {
  flex: 1 !important;
  display: flex;
  flex-direction: column;
}
.container {
  flex: 1;
}

footer {
  background-color: #f5f5f5;
  padding: 10px;
  text-align: center;
  bottom: 0;
}