node loads incomplete page [duplicate]

This question already has an answer here:

• Serve static files using routes in express.js 4 answers

First of all, i am newbie in node.js. I'm trying to load board.html after a post request using passport.js for authentication which works well. The problem is that node loads the page incomplete( images missing, canvas not working and so on). Note that if i run board.html directly to browser it works perfectly.

index.html

 <form method="post" action="/createRoom" >
        <div id="insertCode">
            <input type="text" class="typeCode" name="roomName"
                   placeholder="code">
            <button type="submit"  class="orange"></button>
        </div>
        </form>

app.js

function checkAuthentication(req,res,next){
    if(req.isAuthenticated()) {
        console.log('authenticated');
        next();
    } else{
        console.log('not_authenticated');
        res.redirect("/login.html");
    }
}

app.post('/createRoom', checkAuthentication,function(req,res){
    console.log(req.isAuthenticated());      
    res.redirect('board.html');
})


app.get('*',function(req,res){
    console.log('404');
  res.redirect("/404.html");
});

console

authenticated
true

404
404
404
...

Any ideas; Thanks in advance

via user3649152