'humberger menu stop scrolling main body css

I am trying to implement a hamburger menu. My expectation is when I will click on hamburger menu then the whole screen will contain only hamburger menu and there will be no scrolling and I don't want to see any content under body tag. Also I don't want any scroll option in hamburger menu. The whole screen after clicking the hamburger menu icon will contain only menu list.

below is the code for CSS: here #nav.active #menu I'm trying to control the displaying menu. Its connected with Javascript. But I don't get my expected output it always scroll y.

const btnMobile = document.getElementById('btn-mobile');
        
function toggleMenu(event) {
    if (event.type === 'touchstart') event.preventDefault();
    const nav = document.getElementById('nav');
    nav.classList.toggle('active');
    const active = nav.classList.contains('active');
    event.currentTarget.setAttribute('aria-expanded', active);
    if (active) {
        event.currentTarget.setAttribute('aria-label', 'Fechar Menu');
    } else {
        event.currentTarget.setAttribute('aria-label', 'Abrir Menu');
    }
}

btnMobile.addEventListener('click', toggleMenu);
btnMobile.addEventListener('touchstart', toggleMenu);

body, ul {
    margin: 0px;
    padding: 0px;
}

a {
    color: black;
    text-decoration: none;
    font-family: sans-serif;
}

a:hover {
    background: rgba(0, 0, 0, 0.05);
}

#logo {
    font-size: 1.5rem;
    font-weight: bold;
}

#header {
    box-sizing: border-box;
    height: 70px;
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #e7e7e7;
}

#menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
}

#menu a {
    display: block;
    padding: 0.5rem;
}

#btn-mobile {
    display: none;
}

@media (max-width: 600px) {
    #menu {
        display: block;
        position: absolute;
        width: 100%;
        top: 70px;
        right: 0px;
        background: #e7e7e7;
        transition: 0.6s;
        z-index: 1000;
        height: 0px;
        visibility: hidden;
        overflow-y: hidden;
    }

    #nav.active #menu {
        height: calc(100vh - 70px);
        visibility: visible;
        overflow-y: auto;
    }

    #menu a {
        padding: 1rem 0;
        margin: 0 1rem;
        border-bottom: 2px solid rgba(0, 0, 0, 0.05);
    }

    #btn-mobile {
        display: flex;
        padding: 0.5rem 1rem;
        font-size: 1rem;
        border: none;
        background: none;
        cursor: pointer;
        gap: 0.5rem;
    }

    #hamburger {
        border-top: 2px solid;
        width: 20px;
    }

    #hamburger::after,
    #hamburger::before {
        content: '';
        display: block;
        width: 20px;
        height: 2px;
        background: currentColor;
        margin-top: 5px;
        transition: 0.3s;
        position: relative;
    }

    #nav.active #hamburger {
        border-top-color: transparent;
    }

    #nav.active #hamburger::before {
        transform: rotate(135deg);
    }

    #nav.active #hamburger::after {
        transform: rotate(-135deg);
        top: -7px;
    }
}

<!DOCTYPE html>
<html lang="pt-br">
<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>Menu Mobile</title>
    <link rel="stylesheet" href="./style.css">
</head>
<body>
    <header id="header">
        <a id="logo" href="">Logo</a>
        <nav id="nav">
            <button aria-label="Abrir Menu" id="btn-mobile" aria-haspopup="true" aria- controls="menu" aria-expanded="false">Menu
                <span id="hamburger"></span>
            </button>
            <ul id="menu" role="menu">
                <li><a href="/">Sobre</a></li>
                <li><a href="/">Produtos</a></li>
                <li><a href="/">Portfólio</a></li>
                <li><a href="/">Contato</a></li>
            </ul>
        </nav>
    </header>
    <div class="circle1"></div>
    <div class="circle2"></div>
    <div class="circle1"></div>
    <div class="circle2"></div>
    <script src="./script.js"></script>
</body>

</html>

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'humberger menu stop scrolling main body css

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