.background-body{ 
background-color: rgb(183, 15, 15);
text-align: center;
background-repeat: no-repeat;
background-image: url("../img/background-mobile.png");
background-position: top center;
}

@media (min-width: 768px) {
   .background-body{ 
         background-size: 2000px; 
         background-color: rgb(183, 15, 15);
      text-align: center;
      background-repeat: no-repeat;
      background-image: url("../img/background-gradient.png");
      background-position: top center;
    }
}