.login-dark {
    background-image: url('/img/logo/login_background.jpg');
    height: 100vh;
    /* height: 810px; */
    /* background: #475d62; */
    background-size: cover;
    position: relative;
}

    .login-dark form {
        max-width: 400px;
        width: 90%;
        background: rgba(0,0,0,0.7);
        border-radius: 4px;
        transform: translate(-50%, -50%);
        position: absolute;
        top: 50%;
        left: 50%;
        color: #fff;
        box-shadow: 3px 3px 4px rgba(0,0,0,0.2);
        padding: 32px;
    }

        .login-dark form .form-control {
            background: none;
            border: none;
            border-bottom: 1px solid #434a52;
            border-radius: 0;
            box-shadow: none;
            outline: none;
            color: inherit;
        }

        .login-dark form .btn-primary {
            background: rgba(0,0,0,0.1);
            border: 1px solid #434a52;
            border-radius: 4px;
            padding: 11px;
            box-shadow: none;
            margin-top: 26px;
            text-shadow: none;
            outline: none;
        }

            .login-dark form .btn-primary:hover, .login-dark form .btn-primary:active {
                background: #214a80;
                outline: none;
            }

        .login-dark form .forgot {
            display: block;
            text-align: center;
            font-size: 12px;
            color: white;
            <!-- opacity: 0.9; -->
            text-decoration: none;
        }

            .login-dark form .forgot:hover, .login-dark form .forgot:active {
                opacity: 1;
                text-decoration: none;
            }