.main-logo {
    background: url('https://testfm.syenbi.pl/resources/images/logo/logo-first2-sm.png') no-repeat center center; 
    }

    @media (min-width: 992px) {
        .main-logo {
            background-size: cover;
        }
    }

.first-logo {
    background: url('https://testfm.syenbi.pl/resources/images/logo/logo-first2.png?v=1') no-repeat center center;   
      
    margin-top: 10px;
    margin-bottom: 10px;
    }

.login-logo {
    background-size: 150px;
    margin-top: -25px !important;
}