sample-app/src/main/resources/templates/index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Example Java App</title>
    <link rel="icon" type="image/png" href="/favicon.ico">
    <style>
        html, body {
            font-family: sans-serif;
            margin: 0;
            height: 95%;
        }
        .content-centered {
            display: flex;
            align-items: center;
            justify-content: center;
        }
    </style>
</head>
<body>
    <div class="content-centered" style="margin: 0 auto; flex-direction: column; width: 100%; height: 100%;">
        <div class="content-centered">
            <a href="https://tekton.dev/"><img src="/tekton-horizontal-color.png" alt="Tekton Logo"></a>
        </div>
        <h1>Hello, Builder!</h1>
    </div>
</body>
</html>