tr:nth-child(even) {background-color: #f2f2f2;}
.bg-login-image-left{background:url(../img/login.jpg);background-position:center;background-size:cover}
.bg-login-image-right{background:url(../img/loginrechts.jpg);background-position:center;background-size:cover}
.bg-login-image-help{background:url(../img/logo.png);background-position:center;background-size:contain;  background-repeat: no-repeat;
}