<html>
<head>
<meta charset="UTF-8">
<script>
function setRGB(){
var r = document.getElementById("r").value;
var g = document.getElementById("g").value;
var b = document.getElementById("b").value;
var c = "#" + hex(r) + hex(g) + hex(b);
document.body.style.backgroundColor = c;
document.getElementById("hex").textContent=c;
}
function hex(v){
v = parseInt(v);
var hex = v.toString(16);
if(v < 16){hex= "0" + hex}
return hex;
}
</script>
</head>
<body>
<h1 style="background-color:white">RGB:<span id="hex"></span></h1>
<p>
R:<input type ="range" min="0" max="255" id="r" onchange="setRGB()" /><br />
G:<input type ="range" min="0" max="255" id="g" onchange="setRGB()" /><br />
B:<input type ="range" min="0" max="255" id="b" onchange="setRGB()" />
</p>
</body>
</html>
