body,
body.portal-shell{
    background-color:#f4f7fb;
    background-image:linear-gradient(rgba(244,247,251,.90),rgba(244,247,251,.90)),url('jk-background-logo.jpg');
    background-repeat:no-repeat;
    background-position:center center;
    background-size:auto,min(420px,42vw);
    background-attachment:fixed;
}
body.login-page{
    background-color:#eaf0f7;
    background-image:linear-gradient(rgba(234,240,247,.90),rgba(234,240,247,.90)),url('jk-background-logo.jpg');
    background-repeat:no-repeat;
    background-position:center center;
    background-size:auto,min(420px,42vw);
    background-attachment:fixed;
}
.login-card{
    background-color:#fff;
    background-image:linear-gradient(rgba(255,255,255,.91),rgba(255,255,255,.91)),url('jk-background-logo.jpg');
    background-repeat:no-repeat;
    background-position:80% center;
    background-size:auto 240px;
}
@media(max-width:700px){
    body,body.portal-shell,body.login-page{background-size:auto,min(280px,65vw)}
    .login-card{background-position:center 75%;background-size:auto 190px}
}
@media print{
    body{background-image:none!important}
}