I put a background x on my site, with the css code:
body
{
background-image: url("../imagens/back.jpg");
background-color: rgba(64, 118, 182, 1);
background-repeat: no-repeat;
background-size: auto;
}
I wanted the image not to repeat, but to be fixed on the screen, when the user rolled the scroll would not change the background of the site, the background would remain in place.