options.html

<!DOCTYPE html>
<html>
<head>
    <title>Issue redirect options</title>

    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
    <link href="styles.css" rel="stylesheet">
</head>
<body class="nx-jira-ex-options">
    <form>
        <div class="form-group">
            <label for="urlPattern">Jira URL pattern</label>
            <input type="text" class="form-control" id="urlPattern" aria-describedby="urlPatternHelp">
            <small id="urlPatternHelp" class="form-text text-muted">Plugin will run on pages matched this pattern</small>
            <div class="invalid-feedback">
                Field is required
            </div>
        </div>

        <div class="btn btn-primary" id="save">Save</div>
    </form>

    <script src="options.js"></script>
</body>

</html>