<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Modbus Circle</title>
<style>
.circle {
width: 100px;
height: 100px;
border-radius: 50%;
background-color: {{ color }};
}
</style>
</head>
<body>
<h1>Circle Color Controlled via Modbus</h1>
<div class="circle"></div>
</body>
</html>