html,
body {
  height: 100%;
}
body {
  display: -ms-flexbox;
  display: flex;
  -ms-flex-align: center;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
  background-color: #f5f5f5;
}
.form-signin {
  width: 100%;
  max-width: 330px;
  padding: 15px;
  margin: 0 auto;
}
.form-signin .checkbox {
  font-weight: 400;
}
.form-signin .form-control {
  position: relative;
  box-sizing: border-box;
  height: auto;
  padding: 10px;
  font-size: 16px;
  margin-top: 5px;
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}
.form-signin .form-control:focus {
  z-index: 2;
}

.form-control.is-valid {
  border-color: #28a745;
  box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
}

.form-control.is-invalid {
  border-color: #dc3545;
  box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}

.field-error {
  display: block;
  width: 100%;
  margin-top: 0.25rem;
  font-size: 0.875em;
  color: #dc3545;
}

.btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.alert {
  margin-bottom: 2rem;
  border-radius: 0.375rem;
}

.alert-dismissible .close {
  padding: 0.75rem 1.25rem;
  color: inherit;
}

.form-group {
  margin-bottom: 1rem;
}

/* Input focus improvements */
.form-control:focus {
  border-color: #80bdff;
  outline: 0;
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* Responsive improvements */
@media (max-width: 576px) {
  .form-signin {
    padding: 10px;
    max-width: 100%;
    margin: 0 15px;
  }
}

.bd-placeholder-img {
  font-size: 1.125rem;
  text-anchor: middle;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

@media (min-width: 768px) {
  .bd-placeholder-img-lg {
    font-size: 3.5rem;
  }
}