html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  background-image: url('../image/login-bg.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  -ms-flex-align: center;
  align-items: center;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-direction: column;
  flex-direction: column;
  height: 100vh;
  -ms-flex-pack: center;
  justify-content: center;
}