.meu-login{
    background: url('https://lagodosrodrigues.ma.gov.br/transparencia/assets/images/security-background.jpg') no-repeat center center fixed !important; 
    -webkit-background-size: cover  !important;
    -moz-background-size: cover  !important;
    -o-background-size: cover  !important;
    background-size: cover  !important;
}