@media screen and (max-width: 991px) {   
    .main-logo {    
        background: url('https://poc-test.syenbi.pl/resources/images/logo/logo-syenbi-sm.png') no-repeat left center; 
             
    }
}
@media screen and (min-width: 992px) {   
    .main-logo {
        background: url('https://poc-test.syenbi.pl/resources/images/logo/logo-syenbi-sm.png') no-repeat center center; 
                background-size: cover;
            }
}

.first-logo {
    background: url('https://poc-test.syenbi.pl/resources/images/logo/logo-syenbi.png') no-repeat center center;   
      
    margin-top: 10px;
    margin-bottom: 10px;
    }

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