body.wp-core-ui {
background-image: url(//agmar.sklep.pl/wp-content/plugins/sonets/css/img/sonets-bg.png);
background-size: cover;
background-position: center;
background-repeat: no-repeat;
}
body.wp-core-ui #login h1 a {
background-image: url(//agmar.sklep.pl/wp-content/plugins/sonets/css/img/sonets-logo-big.png);
height: 300px;
width: 300px;
background-size: 100% 100%;
background-position: center;
background-repeat: no-repeat;
margin: 0px auto 10px auto;
}