@media (min-width: 20.0000em) { /* up to min-width 30.0625em */
    .loginForm {
        width: 15em;
    }
}

@media (min-width: 40.0625em) { /* up to min-width 80.0625em (or bigger) */
    .loginForm {
        width: 20em;
    }
}