function random_bg_color() {  
    var x = Math.floor(Math.random() * 256);  
    var y = Math.floor(Math.random() * 256);  
    var z = Math.floor(Math.random() * 256);  
    var bgColor = "rgb(" + x + "," + y + "," + z + ")";  
 console.log(bgColor);  
    
    document.body.style.background = bgColor;  
    }  
  
random_bg_color();