Reports

HTML (for page the needs image)
<body class="with-bg">

HTML(pages that dont need image)
<body class="no-bg">

CSS


body.with-bg {
  background-image: url("bg.jpg");
  background-size: cover;
  background-repeat: no-repeat;
}


body.no-bg {
  background-image: none !important;
}

!important this might ensure that background is completely removed if any another rule was stronger

Or you may also use inline css

Please upvote if it works !

79806343