Horizontal scroll slider – instagram storys slider

I’m trying to make an Instagram story, but I’m having trouble even though everything is correct in javascript, can you help?

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>HTML</title>
    <link rel="stylesheet" href="./style.css">
    <link rel="stylesheet" href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css" integrity="sha384-AYmEC3Yw5cVb3ZcuHtOA93w35dYTsvhLPVnYs9eStHfGJvOvKxVfELGroGkvsg+p" crossorigin="anonymous"/>

</head>
<body>
    <div class="container">
        <div class="horizontal-scroll">
            <button class="btn-scroll" id="btn-scroll-left" onclick="scrollHorizontally(1)" ><i  class="fas fa-chevron-left"></i></button>
            <button class="btn-scroll" id="btn-scroll-right" onclick="scrollHorizontally(-1)"  ><i  class="fas fa-chevron-right"></i></button>
            <div class="storys-container">
                <div class="story-circle"><img src="./img/face/1.jfif "></div>
                <div class="story-circle"><img src="./img/face/2.jfif "></div>
                <div class="story-circle"><img src="./img/face/3.jfif "></div>
                <div class="story-circle"><img src="./img/face/4.jfif "></div>
                <div class="story-circle"><img src="./img/face/5.jfif "></div>
                <div class="story-circle"><img src="./img/face/6.jfif "></div>
                <div class="story-circle"><img src="./img/face/7.jfif "></div>
                <div class="story-circle"><img src="./img/face/8.jfif "></div>
                <div class="story-circle"><img src="./img/face/9.jfif "></div>

            </div>
        </div>
    </div>
    <script src="./script.js"></script>
</body>
</html>

css

body{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

.container{
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f9f9f9;
    height: 100vh;
}

.horizontal-scroll{
    width: 600px;
    height: 80px;
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 5px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    position: relative;
    overflow: hidden;
}


.horizontal-scroll .btn-scroll{
    background-color: #fff;
    color: #999;
    box-shadow: 0 0 10px #999;
    padding: 5px 8px;
    border: 0;
    border-radius: 50%;
    margin: 0 5px;
    z-index: 1;
    cursor: pointer;
    transition: 1s;
}



.storys-container{
    display: flex;
    flex-direction: row;;
    justify-content: flex-start;
    align-items: center;
    position: absolute;
    left: 0;
    transition: 0.5s all ease-out;
}

.story-circle{
    background: linear-gradient(rgb(231,0,231),rgb(255,115,0));
    width: 60px;
    height: 60px;
    margin: 15px 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;

}

.story-circle img{
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: 2px solid #fff;



}






javascript

        let currentScroolPosition = 0;
        let scroolAmount = 320;

        const sCont = document.querySelector(".storys-container")
        const hScroll = document.querySelector(".horizontal-scroll")
        const btnScrollLeft = document.querySelector("#btn-scroll-left")
        const btnScrollRight = document.querySelector("#btn-scroll-right")


        btnScrollLeft.style.opacity = "0"


        let maxScroll = -sCont.offsetWidth + hScroll.offsetWidth;

        function scrollHorizontally(val){
            currentScroolPosition += ( val * scrollAmount );

            if(currentScroolPosition > 0){
                currentScroolPosition = 0;
                btnScrollLeft.style.opacity = "0"
            }else{
                btnScrollLeft.style.opacity = "1"

            }

            if(currentScroolPosition <= maxScroll){
                currentScroolPosition = maxScroll;
                btnScrollRight.style.opacity = "0"
            }else{
                btnScrollRight.style.opacity = "1"

            }


            sCont.style.left = currentScroolPosition + "px";
        }

I’m waiting for your answers, I couldn’t solve this problem for hours

Here is the video of the friend who made it. everything is correct but it’s not working for me either.
https://www.youtube.com/watch?v=LFVFxDXQxxE&ab_channel=Fullstack4Dev