@media (min-width: 992px) {  
    .layer_front { min-width: 1000px; max-width: 100%; min-height: 500px; max-height: auto; }
    #logForm{ height: 600px; border-radius: 0rem; }
} 

@media (max-width: 768px) { 

} 

@media (max-width: 576px) {     
    .layer_front { min-width: 100%; max-width: 100%; min-height: 100vh; max-height: auto; }    
    #logForm{ height: 100vh; border-radius: 0rem; }
}