body {
    min-height: 100vh;
    background-color: #CCC;
    background-image: url('https://unsplash.it/g/2130/1080?random');
}

.login-form {
   margin-top: 50vh;
    padding: 20px 30px;
/*     background-color: rgba(0, 0, 0, .9); */
    background-color: #FFF; 
    color: rgba(0, 0, 0, .9); ;

    transform: translateY(-50%);
}

.login-form h1 {
    margin: 0 0 5px;
}

.login-form h2 {
    margin: 0 0 30px;
    font-size: 1em;
}