.login-basetint-adm{
    background: url('https://basetint.com.br/app/images/login_basetint_2020.svg') 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;
}