Scroll Snap for div that looks like an iPhone in HTML

I made this iPhone in HTML (Please do not pay attention to the spaghetti code, and it's in german, if it is necessary i can translate it with pleasure):

var time = document.getElementById("time");
    var notification = document.getElementById("notification");
    var notificationHeader = document.getElementById("notificationHeader");
    var notificationDescription = document.getElementById("notificationDescription");
    var verificationCode = Math.floor(1000 + Math.random() * 9000);
    var input = document.getElementById("instagramNumberText");
    var correctOrWrongCheck = document.getElementById("correctOrWrongCheck");
    var verificationCodePTag = document.getElementById("verificationCode");
    var instagram = document.getElementById("instagramApp");
    var mail = document.getElementById("mailApp");
    var createAccountButton = document.getElementById("createAccount");
    var createAccountForm = document.getElementById("createAccountForm");
    var verificationCodeInstagramPage = document.getElementById("verificationCodeInstagramPage");
    var controlVerificationCodeButton = document.getElementById("controlVerificationCode");
    var continueToInstagramAccountButton = document.getElementById("continueToInstagramAccount");
    var verificationCodeEmailDescription = document.getElementById("verificationCodeEmailDescription");
    var verificationCodeEmail = document.getElementById("verificationCodeEmail");
    var erfolgreichAngemeldet = document.getElementById("erfolgreichAngemeldet");
    var instagramAccount = document.getElementById("instagramAccount");

    var instagramName = document.getElementById("instagramName");
    var instagramNameInput = document.getElementById("instagramNameInput");


    // Time

    function checkTime(i) {
        if (i < 10) {
            i = "0" + i;
        }
        return i;
    }

    function startTime() {
        var today = new Date();
        var h = today.getHours();
        var m = today.getMinutes();
        // add a zero in front of numbers<10
        m = checkTime(m);
        document.getElementById('time').innerHTML = h + ":" + m;
        t = setTimeout(function() {
            startTime()
        }, 500);
    }
    startTime();

    // Insta

    function controlVerificationCode() {
        if (input.value == verificationCode) {
            correctOrWrongCheck.innerHTML = "Der Code war korrekt!";
            continueToInstagramAccountButton.style.display = "block";
            continueToInstagramAccountButton.style.margin = "5px auto";
            controlVerificationCodeButton.style.display = "none";
        } else if (input.value !== verificationCode) {
            correctOrWrongCheck.innerHTML = "Der Code ist leider Falsch!";
            continueToInstagramAccountButton.style.display = "none";
            controlVerificationCodeButton.style.display = "block";
        }
    }

    verificationCodeEmailDescription.innerHTML = "Ihr Bestätigunscode lautet: " + verificationCode;

    // OPEN AND CLOSE APPS

    function openVerificationCodeInstagramPage() {
        createAccountForm.style.display = "none";
        verificationCodeInstagramPage.style.display = "block"
        verificationCodeEmail.style.display = "block";
        instagramName.value = instagramNameInput.value;
        notification.style.transform = "translate(-50%, -50%) scale(0)";
        notificationDescription.innerHTML = "Ihr Bestätigunscode lautet: ...";
        setTimeout(
            function() {
                notification.style.transform = "translate(-50%, -50%) scale(1)";
            }, 1000);
         setTimeout(
            function() {
                notification.style.transform = "translate(-50%, -50%) scale(0)";
            }, 7000);
    }

    function continueToInstagramAccount() {
        verificationCodeInstagramPage.style.display = "none";
        instagramAccount.style.display = "flex";
        erfolgreichAngemeldet.display = "none";
        notificationDescription.innerHTML = "Erfolgreich bei Instagram angemeldet"
        notification.style.transform = "translate(-50%, -50%) scale(0)";
        erfolgreichAngemeldet.style.display = "block";

        setTimeout(
            function() {
                notification.style.transform = "translate(-50%, -50%) scale(1)";
            }, 1000);
            setTimeout(
            function() {
                notification.style.transform = "translate(-50%, -50%) scale(0)";
            }, 7000);


        var counter = 0;
        var followers = document.getElementById('followers');
        setTimeout(function(){
            var st = setInterval(function(){
                followers.innerHTML = ++counter;
            },100)
        },100);
        }


    function closeNotification() {
        notification.style.transform = "translate(-50%, -50%) scale(0)";
    }

    function openInstagram() {
        instagram.style.transform = "scale(1)";
    }
    function openMail() {
        mail.style.transform = "scale(1)";
    }

    function closeApp() {
        instagram.style.transform = "scale(0)";
        mail.style.transform = "scale(0)";
    }

    window.onload = function() {
        document.getElementById("instagramNumberText").value = '';
    }

* {
            margin: 0;
            padding: 0;
            font-family: 'Roboto',sans-serif;
            user-select: none;
        }

        input:focus, textarea:focus {
            outline: 0;
        }

        #phone {
            height: 600px;
            width: 350px;
            border-radius: 50px;
            position: absolute;
            top: 600px;
            left: 50%;
            -ms-transform: translate(-50%, -50%);
            transform: translate(-50%, -50%);
            border-top: 90px solid;
            border-right: 15px solid;
            border-left: 15px solid;
            border-bottom: 90px solid;
            background-image: url("https://ioshacker.com/wp-content/uploads/2019/06/iOS-13-wallpaper.jpg");
            background-position: center;
            background-repeat: no-repeat;
            background-size: cover;
        }

        .app {
            box-shadow: 0 0 9px -4px #000;
        }

        #topbar {
            padding: 0.3em;
            color: #fff;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 20px;
            transform: translate(-4%,0) scale(0.9);
            width: 370px;
        }

        #connection {
            display: flex;
            align-items: center;
            width: 110px;
            justify-content: space-around;
        }

        #battery {
            display: flex;
            align-items: center;
            width: 110px;
            justify-content: end;
        }

        #battery .bi-battery-full {
            font-size: 23px;
            margin-left: 5px;
        }

        #topbar .bi-wifi-2 {
            font-size: 25px;
            margin-top: -3px;
        }

        #time {
            text-align: center;
        }

        #notification {
            margin: 0;
            position: absolute;
            top: 365px;
            left: 50%;
            -ms-transform: translate(-50%, -50%) scale(0);
            transform: translate(-50%, -50%) scale(0);
            height: 85px;
            width: 315px;
            background: #EDEBED;
            border-radius: 10px;
            z-index: 10000;
            transition: all 0.5s;
            box-shadow: 0 0 10px -1px #525252;
            padding: 0.5em 0 0.5em 1em;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        #notification h1 {
            font-size: 23px;
        }

        #appsOne {
            display: flex;
            justify-content: space-around;
            flex-wrap: wrap;
        }

        #instagramIcon, #verificationCode, #mailIcon {
            margin: 20px;
        }

        .app {
            font-size: 40px;
            width: 50px;
            height: 50px;
            display: flex;
            justify-content: center;
            align-items: center;
            border-radius: 10px;
            transition: all 0.2s;
        }

        .app:hover {
            cursor: pointer;
            filter: brightness(90%);
        }

        .bi-instagram, .bi-envelope-fill {
            width: 40px;
            height: 40px;
            color: #fff;
            font-family: sans-serif;
        }

        /* Instagram */

        #instagramIcon {
            background: linear-gradient(45deg, #f09433 0%,#e6683c 25%,#dc2743 50%,#cc2366 75%,#bc1888 100%);
        }

        #instagramApp {
            position: absolute;
            top: 0;
            left: 0;
            background: #EAEAEA;
            height: 100%;
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            transition: all 0.3s;
            transform: scale(0);
            z-index: 99999;
            text-align: center;
        }
        .instagramHeader {
            font-family: 'Handlee', cursive;
            font-size: 35px;
        }
        .instagramSecondHeader {
            font-size: 15px;
            width: 260px;
            margin: 1em 0;
        }
        #instagramNameInput, #instagramEmail, #instagramNumberText {
            font-size: 15px;
            padding: 0.5em;
            border: 1px solid #D1D1D1;
            margin: 0.5em 0 0.5em 0;
            width: 220px;
        }
        .instagramButton {
            width: 236px;
            font-size: 15px;
            padding: 0.5em;
            background: #3296F0;
            color: #fff;
            border: none;
            margin: 0.5em 0;
            transition: all 0.2s;
        }
        .instagramButton:hover {
            filter: brightness(80%);
            cursor: pointer;
        }
        #verificationCodeInstagramPage {
            display: none;
        }
        #continueToInstagramAccount {
            display: none;
        }

        #instagramAccount {
            display: none;
            justify-content: flex-start;
            height: 100%;
            width: 100%;
            background: #f7f7f7;
            flex-direction: column;
            align-items: center;
        }
        #instagramName {
            font-size: 20px;
            text-align: left;
            width: 85%;
            padding: 20px 20px 15px 10px;
            border-bottom: 1px solid gray;
            height: 20px;
            border-right: none;
            border-top: none;
            border-left: none;
            background: none;
        }
        #profilePicture {
            font-size: 35px;
            width: 80px;
            height: 80px;
            display: flex;
            justify-content: center;
            align-items: center;
            background: #eae9e9;
            border-radius: 100000px;
            margin: 20px;
            border: 1px solid #6f6e6e;
            color: #6f6e6e;
        }
        #instagramPictureAndNumbers {
            display: inherit;
            width: 360px;
        }
        #numbers {
            width: 225px;
            height: 45px;
            margin: 35px 0 0 0;
        }
        #userDescription {
            width: 320px;
            font-size: 13px;
            border: none;
            background: none;
            resize: none;
        }
        .bi-table {
            font-size: 25px;
            border-bottom: 1px solid;
            width: 90%;
            margin-top: 0.5em;
        }
        #emptyImages {
            color: #c7c7c7;
            margin: 100px;
            font-size: 14px;
        }

        /* Mail */
        #mailIcon {
            background: linear-gradient(0deg, #05ffff 0%, #3cabe6 30%, #2763dc 70%);
        }
        #mailApp {
            position: absolute;
            top: 0;
            left: 0;
            background: #f6f6f6;
            height: 100%;
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: flex-start;
            flex-direction: column;
            transition: all 0.3s;
            transform: scale(0);
            z-index: 99999;
            text-align: center;
        }
        #mailHeader {
            font-size: 25px;
            padding: 20px;
            background: #fff;
            width: 88%;
            z-index: 999;
        }
        #verificationCodeEmail {
            display: none;
        }
        .email {
            background: #fff;
            width: 97%;
            padding: 5px;
            border-top: 1px solid #e6e6e6;
        }
        .emailHeader {
            text-align: left;
            margin: 10px;
            font-size: 25px;
        }
        #verificationCodeEmailDescription, #erfolgreichAngemeldetDescription {
            text-align: left;
            margin: 10px;
        }

        #erfolgreichAngemeldet {
            display: none;
        }

        /* Home Button */
        #homeButton {
            position: absolute;
            height: 60px;
            width: 60px;
            background: transparent;
            z-index: 9999;
            bottom: -107px;
            border-radius: 100000px;
            left: 50%;
            -ms-transform: translate(-50%, -50%) rotate(-10deg);
            transform: translate(-50%, -50%) rotate(-10deg);
            border: 1px outset;
            cursor: pointer;
        }

<meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.4.1/font/bootstrap-icons.css">
    <link rel="preconnect" href="https://fonts.gstatic.com">
    <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@100;300;400&display=swap" rel="stylesheet">

<div id="notification" onclick="closeNotification();">
    <h1 id="notificationHeader"><b>Neue Email erhalten!</b></h1>
    <p id="notificationDescription"></p>
</div>

<div id="phone">

    <div id="topbar">

        <div id="connection">
            <i class="bi bi-bar-chart-fill"></i>
            LIDL LTE
            <i class="bi bi-wifi-2"></i>
        </div>

        <p id="time"></p>

        <div id="battery">
            98%
            <i class="bi bi-battery-full"></i>
        </div>
    </div>

<div id="slider">
        <div id="appsOne">
            <!-- Instagram -->
            <div id="instagramIcon" class="app" onclick="openInstagram();"><i class="bi bi-instagram"></i></div>
                <div id="instagramApp">
                    <form id="createAccountForm" action="#" onsubmit="openVerificationCodeInstagramPage(); return false;">
                        <h1 class="instagramHeader">Instagram</h1>
                        <p>Erstelle einen Account</p>
                        <input type="text" id="instagramNameInput" placeholder="Name" maxlength="12" autocomplete="off" required>
                        <input type="email" id="instagramEmail" placeholder="E-Mail" autocomplete="off" required>
                        <button type="submit" id="createAccount" class="instagramButton">Erstellen</button>
                    </form>

                    <div id="verificationCodeInstagramPage">
                        <h1 class="instagramHeader">Bestätigen</h1>
                        <p class="instagramSecondHeader">Wir haben ihn einen Bestätigungscode per Email gesendet!</p>
                        <input type="text" id="instagramNumberText" maxlength="4" onkeypress="return /[0-9]/i.test(event.key)" placeholder="Bestätigungscode"><br>
                        <button onclick="controlVerificationCode();" id="controlVerificationCode" class="instagramButton">Bestätigen</button>
                        <button class="instagramButton" id="continueToInstagramAccount" onclick="continueToInstagramAccount()">Weiter</button>
                        <p id="correctOrWrongCheck"></p>
                    </div>

                    <div id="instagramAccount">
                        <input type="text" id="instagramName">
                        <div id="instagramPictureAndNumbers">
                            <div id="profilePicture"><i class="bi bi-person-fill"></i></div>
                            <table id="numbers">
                                <tr>
                                    <th id="posts">0</th>
                                    <th id="followers">1</th>
                                    <th id="following">0</th>
                                </tr>
                                <tr>
                                    <td>Posts</td>
                                    <td>Followers</td>
                                    <td>Following</td>
                                </tr>
                            </table>
                        </div>
                        <textarea id="userDescription" placeholder="Beschreibung..." rows="10"></textarea>

                        <i class="bi bi-table"></i>
                        <p id="emptyImages">No images found</p>
                    </div>
            </div>

            <div id="appsTwo">
                Second App Page
            </div>

</div>

        <!-- Mail App -->
        <div id="mailIcon" class="app" onclick="openMail();"><i class="bi bi-envelope-fill"></i></div>
            <div id="mailApp">
                <h1 id="mailHeader">E-Mails</h1>

                <div class="email" id="erfolgreichAngemeldet">
                    <h1 class="emailHeader">Instagram</h1>
                    <p class="emailDescription" id="erfolgreichAngemeldetDescription">Erfolgreich angemeldet</p>
                </div>

                <div class="email" id="verificationCodeEmail">
                    <h1 class="emailHeader">Instagram</h1>
                    <p class="emailDescription" id="verificationCodeEmailDescription">Ihr Bestätigunscode lautet</p>
                </div>

            </div>
    </div>


    <div id="homeButton" onclick="closeApp();"></div>

To see the iPhone better you should click on Full-Page in the snippet.

My problem was that I have 2 divs: #appsOne and #appsTwo which are in the div #slider. On the home page of the iPhone you can see two apps (#appsOne) and a text (#appsTwo) in the middle. The apps (#appsOne) should stay where they are but the text (#appsTwo) should be made on a second page with a horizontal scroll snap. How could I do that?

And here's an image, how it looks like without the slider and the #appsTwo div:

from Scroll Snap for div that looks like an iPhone in HTML