.builder-template-login{
    background: url('https://obraseletricidade.com.br/canteiros/electricity-cobra.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;
}
h1{
    text-align: center;
    color: white;
}