html,
body {
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
  background-color: #f5f5f5;
}

.form-signin {
  width: 100%;
  max-width: 400px;
  padding: 15px;
  margin: auto;
}

.form-signin .helpers {
  color: #666;
}


.form-signin .checkbox {
  font-weight: 400;
}

@media (min-width: 1600px) {
  .form-signin {
    max-width: 600px;
  }
}