html,
body {
  width: 100%;
  height: 100%;
  min-height: 100%;
}
.container {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}
.error {
  color: red;
  margin-left: auto;
  margin-right: auto;
  width: 70%;
  text-align: center;
}