.login_form {
    min-width: 500px;
    position: absolute;
    text-align: center;
    top: 30%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2.5rem
  }
  @media (max-width: 500px) {
    .login_form {
      min-width: 90%;
    }
  }

.login_form #submit{
    height: 100%;
  }