html,
body {
  height: 100%;
  background-color: #f5f5f5;
}

main {
  display: flex;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
}

.form-signin {
  text-align: center;
  max-width: 370px;
  padding: 45px;
}

.form-signin .form-floating:focus-within {
  z-index: 2;
}

.form-signin input[type='text'] {
  margin-bottom: -1px;
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
}

.form-signin input[type='password'] {
  margin-bottom: 10px;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}

.error_box {
  display: block;
  margin: 4px 0;
  font-size: 12px;
  line-height: 14px;
  color: red;
}

form div a {
  color: black;
}

@media screen and (min-width: 769px) {
  header {
    margin-bottom: 100px;
  }
}