why a blank html return - javascript

I got this template from this site: After trying out some templates, they were ok. But trying out this bot template am getting a blank html return on this code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>BotUI - Hello World</title>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<link rel="stylesheet" href="https://unpkg.com/botui/build/botui.min.css" />
<link rel="stylesheet" href="https://unpkg.com/botui/build/botui-theme-default.css" />
<meta name="description" content="A hello world bot. A conversational UI built using BotUI.">
</head>
<body>
<div class="botui-app-container" id="hello-world">
<bot-ui></bot-ui>
</div>
<script src="https://cdn.jsdelivr.net/vue/latest/vue.min.js"></script>
<script src="https://unpkg.com/botui/build/botui.js"></script>
<script>
var botui = new BotUI('hello-world');
botui.message.add({
content: 'Hello World from bot!'
});
botui.message.add({
human: true,
content: 'Hello World from human!'
});
document.getElementById("hello-world").innerHTML = content;
</script>
</body>
</html>
What could be the issue?
Regards

The template is working fine, the only issue here is that you need to remove following line
document.getElementById("hello-world").innerHTML = content;
I am not sure, why you have added this line. All the messages should be rendered via botui.message.add() method. BotUI will handle content insertion.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>BotUI - Hello World</title>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<link rel="stylesheet" href="https://unpkg.com/botui/build/botui.min.css" />
<link rel="stylesheet" href="https://unpkg.com/botui/build/botui-theme-default.css" />
<meta name="description" content="A hello world bot. A conversational UI built using BotUI.">
</head>
<body>
<div class="botui-app-container" id="hello-world">
<bot-ui></bot-ui>
</div>
<script src="https://cdn.jsdelivr.net/vue/latest/vue.min.js"></script>
<script src="https://unpkg.com/botui/build/botui.js"></script>
<script>
var botui = new BotUI('hello-world');
botui.message.add({
content: 'Hello World from bot!'
});
botui.message.add({
human: true,
content: 'Hello World from human!'
});
// document.getElementById("hello-world").innerHTML = content;
</script>
</body>
</html>

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This works perfectly fine. Check if you are importing your JS script correctly.
You can put the javascript code into a before the closing tag .
HTML:
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</script>
</body>
Some of online tools like https://playcode.io don't recognise your code but I have tested in vscode and works fine.
Maybe have to use other online tool or can test if you have imported the code well with a console.log("Works fine") into your javascript file.
Sorry for my english.

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