AV3 Menuvanje Na Stil

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <script src="script.js"></script>
    <link rel="stylesheet" href="style.css">
    <title>Practise</title>
</head>
<body>
<button type="button" id="demo" onclick="Functi()">Click me!</button>
</body>
<script src="script.js"></script>
</html>

function Functi()
{
    var x=document.getElementById("demo");
    x.style.color="#9b3838";
}