header img { margin: 30px 0; max-height: 80px; }
h1 { font-size: 1.5rem; margin-bottom: 30px; }
.container { width: 600px; }
.form-group { margin: 7px 0; }

@media only screen and (max-width: 768px)
and (orientation : portrait)  {
    .container { width: 100%; }
}