body {
  height: 100vh;
  display: flex;
  align-items: center;
  background-color: #f5f5f5;
}

#signin-form {
  width: 100%;
  max-width: 330px;
  padding: 15px;
  margin: 0 auto;
}

#signin-form .form-control {
  position: relative;
  box-sizing: border-box;
  height: auto;
  padding: 10px;
  font-size: 16px;
}

#signin-form input[type="email"] {
  margin-bottom: -1px;
}