div#loginbox { 
    position: fixed;
    max-width:320px;
    top:25%;
    left: 50%;
    margin-left:-160px;
}
html body .content .content-wrapper{
    padding:0;
}
div.content-header.row{
    display:none!important;
}
body.vertical-layout.vertical-menu-modern .content, body.vertical-layout.vertical-menu-modern .footer {
    margin-left: 0px !important;
}
html body.fixed-navbar{
    padding-top:0!important;
}

@media(max-width:520px){
    div#loginbox {
        position: relative;
        width:unset;
        max-width:unset;
        left: unset;
        transform:none;
        margin-left:unset;
    }
}