#login_form_container {
    width: 90%;
    max-width: 332px;
    height: 378px;
    margin: 0 auto;
    margin-top: calc(50vh - 189px);
}
#login_form_container input {
    width:100%;
}
#terms_container {
    width:100%;
    text-align:center;
}

h1 { font-size: 1.6em; }

label { font-size:1.3em; width:100%; display:block; padding-bottom:10px;}

h1,h3,label { text-align:center; }