Unable to fill the box using css in JavaScipt

I am making a quiz website using javascript, and with the help of css I am trying to fill the box with color as the quiz goes on. However the code I am writing is not exactly working. any suggestions? I think the game.js class is unable to find progressBarFull. any sort of help will be appreciated.

//////game.js/////

const question = document.getElementById('question');
const choices = Array.from(document.getElementsByClassName('choice-text'));
const progressText = document.getElementById('progressText');
const scoreText = document.getElementById('score');
const progressBarFull = document.getElementById('progressBarFull');

let currentQuestion = {};
let acceptingAnswer = false;
let Score = 0 ;
let QuestionCounter = 0;
let AvailableQuestion = [];

let questions = [
    {
         question:"Inside which HTML element do we put JavaScript?",
         choice1: "<script>",
         choice2: "<javascript>",
         choice3: "<js>",
         choice4: "<scripting>",
         answer: 1
        },
        {
         question:"What is correct syntax for referreing to an external script called xxx.js",
         choice1: "<script href='xxx.js'>",
         choice2: "<script name='xxx.js'>",
         choice3: "<script src='xxx.js'>",
         choice4: "<script file='xxx.js'>",
         answer: 3
        },
        {
         question:"How do you write Hello in an alert box",
         choice1: "msgbox('Hello World')",
         choice2: "alertbox('Hello World')",
         choice3: "msg('Hello World')",
         choice4: "alert('Hello World')",
         answer: 4
        },
]


// Constants

const CORRECT_BONUS = 10;
const MAX_QUESTIONS = 3;
const INCORRECT = 10;

startgame = (  ) =>{
    QuestionCounter=0;
    Score=0;
    AvailableQuestion=[...questions];
    console.log(AvailableQuestion);
    getNewQuestion();
};

getNewQuestion =()=> {
    if(AvailableQuestion.length == 0 || question>= MAX_QUESTIONS){
        // Go to the endpage
        return window.location.assign('/end.html');
    }
    QuestionCounter++;
    progressText.innerText = `Question ${QuestionCounter} / ${MAX_QUESTIONS}`;

    
    // Update The ProgressBar
    progressBarFull.style.width = `${(QuestionCounter / MAX_QUESTIONS) * 100}
    %`
    console.log((QuestionCounter / MAX_QUESTIONS) * 100)


    const questionIndex = Math.floor(Math.random() * AvailableQuestion.length);
    currentQuestion = AvailableQuestion[questionIndex];
    question.innerText = currentQuestion.question;


    // foreach iterates through the choices
    choices.forEach( choice => {
        const number = choice.dataset['number']; 
        // getting number from data-number --- game.html
        choice.innerText = currentQuestion['choice' + number]
    })
    AvailableQuestion.splice(questionIndex, 1);

    acceptingAnswer = true
};

choices.forEach(choice => {
    choice.addEventListener("click", e=> {
        if(!acceptingAnswer) return;
        
        
        acceptingAnswer = false;
        const selectedChoice = e.target;
        const selectedAnswer = selectedChoice.dataset["number"];
        
        // Different ways of using conditions
        // const classToApply = 'incorrect';
        // if(selectedAnswer == currentQuestion.answer){
        //     classToApply = 'correct;'
        // }

        const classToApply = selectedAnswer == currentQuestion.answer ? 'correct' : 'incorrect';
        if (classToApply === 'correct'){
            incrementScore(CORRECT_BONUS)
        }
        else{
            decrementScore(INCORRECT)
        }
        // console.log(classToApply)

        selectedChoice.parentElement.classList.add(classToApply)
        setTimeout(() => {
            selectedChoice.parentElement.classList.remove(classToApply)
            getNewQuestion()
            
        }, 250);

       

        // console.log(selectedAnswer == currentQuestion.answer)
    })

})

incrementScore = num => {
    Score += num;
    scoreText.innerText = Score;
}

decrementScore = num => {
    Score -= num;
    scoreText.innerText = Score;
}

startgame()

/////game.html///

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Game - Play</title>
    <link rel="stylesheet" href="app.css" >
    <link rel="stylesheet" href="game.css">
</head>
<body>
    <div class="container">
        <div id="game" class="justify-center flex-column">
            <div id="hud">
                <div id="hud-item">
                    <p id="progressText" class="hud-prefix">
                        Question
                    </p>
                    <div id="progressBar">
                        <div id="progressBarFull"> </div>
                    </div>
                </div> 
                <div id="hud-item">
                    <p class="hud-prefix">
                        Score
                    </p>
                    <h1 class="hud-mainText" id="score">
                        0
                    </h1>
                </div> 
            </div>
            <h2 id="question">
                Answer to this question?
            </h2>
            <div class="choice-container">
                <p class="choice-prefix">A</p>
                <p class="choice-text" data-number="1">Choice 1</p>
            </div>
            <div class="choice-container">
                <p class="choice-prefix">B</p>
                <p class="choice-text" data-number="2">Choice 2</p>
            </div>
            <div class="choice-container">
                <p class="choice-prefix">C</p>
                <p class="choice-text" data-number="3">Choice 3</p>
            </div>
            <div class="choice-container">
                <p class="choice-prefix">D</p>
                <p class="choice-text" data-number="4">Choice 4</p>
            </div>
        </div>
    </div>
            <script src="game.js"></script>
</body>
</html>

//////game.css////

.choice-container{
    display: flex;
    margin-bottom: 0.5rem;
    width: 100%;
    font-size: 1.8rem;
    border:0.1rem solid rgb(86, 235, 0.25);
    background-color: white;
}

.choice-container:hover{
    cursor: pointer;
    box-shadow: 0 0.4rem 1.4rem 0 rgb(86, 165, 235, 0.5);
    transform: translate(-0.1rem);
    transition: transfor 150ms;
}

.choice-prefix{
    padding:1.5rem 2.5rem;
    background-color: #56a5eb;
    color: white;

}

.choice-text{
    padding: 1.5rem;
    width: 100%;
}

.correct{
    background-color: #28a745;
}

.incorrect{
    background-color: #dc3545;
}

/* HUD */
#hud {
display: flex;
justify-content: space-evenly;
}

.hud-prefix{
    text-align: center;
    font-size: 2rem;
}

.hud-main-text{
    text-align: center;
}

#progressBar{
    width: 20rem;
    height: 4rem;
    border: 0.3rem solid #56a5eb;
    margin-top: 0.9rem;

}

#progressBarFull{
    height: 3.4rem;
    background-color:#56a5eb;
    width: 0%;
}

>Solution :

Irrespective of other issues, the issue is that you are setting an invalid style on progressBarFull.

You have whitespace in your js:

progressBarFull.style.width = `${(QuestionCounter / MAX_QUESTIONS) * 100} %`

This results in setting an invalid style, which won’t even show up in the DOM in something like inspect. For a percentage (%) specifier, it needs to be right after the numeric value.