Mobile Menu for Funnelish

custom.html

<section class="top-nav">
    <input id="menu-toggle" type="checkbox">
    <label class="menu-button-container" for="menu-toggle">
        <div class="menu-button"></div>
    </label>
    <ul class="menu">
        <li><a href="#">Track order</a></li>
        <li><a href="#">Contact</a></li>
        <li><a href="#">FAQ</a></li>
    </ul>
    <div class="menubgfull"></div>
</section>
<style>
.top-nav {
    display: flex;
    flex-direction: row-reverse;
    align-items: center;
    justify-content: space-between;
    color: #000;
    height: 40px;
    position: relative;
    z-index: 10;
    background-color: #fff;
}
.top-nav #menu-toggle {
    display: none;
    z-index: 10;
}
.top-nav .menu-button-container {
    display: flex;
    height: 100%;
    width: 30px;
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
.top-nav .menu-button, 
.top-nav .menu-button::before, 
.top-nav .menu-button::after {
    display: block;
    background-color: #193239;
    position: absolute;
    height: 3px;
    width: 30px;
    transition: transform 400ms cubic-bezier(0.23, 1, 0.32, 1);
    border-radius: 2px;
}
.top-nav .menu-button::before {
    content: '';
    margin-top: -8px;
}
.top-nav .menu-button::after {
    content: '';
    margin-top: 8px;
}
.top-nav ul.menu {
    position: absolute;
    top: 60px;
    right: 0px;
    transform: translateX(20px);
    width: 100vw;
    display: flex;
    flex-direction: column;
    align-items: center;
    list-style-type: none;
    padding: 0;
    margin: 0;
    transition: max-height 0.4s ease-in-out;
    z-index: 99999;
}
.top-nav #menu-toggle:checked ~ .menu li {
    border: 1px solid #DEE5ED;
    height: 3em;
    padding: 10px;
    transition: height 400ms cubic-bezier(0.23, 1, 0.32, 1);
    display: flex;
    justify-content: flex-start;
    width: 100%;
    color: white;
    background-color: #ffffff;
    overflow: hidden;
    position: relative;
}
.top-nav #menu-toggle ~ .menu li {
    margin: 0;
    height: 0;
    padding: 0;
    border: 0;
    /* transition: height 400ms cubic-bezier(0.23, 1, 0.32, 1); */
    display: flex;
    justify-content: flex-start;
    width: 100%;
    color: white;
    background-color: #fff;
    overflow: hidden;
    position: relative;
}
.top-nav .menu > li a {
    color: #000;
    font-size: 18px;
    font-weight: bold;
}
.top-nav #menu-toggle:checked + .menu-button-container .menu-button::before {
    margin-top: 0px;
    transform: rotate(405deg);
}
.top-nav #menu-toggle:checked + .menu-button-container .menu-button::after {
    margin-top: 0px;
    transform: rotate(-405deg);
}
.top-nav #menu-toggle:checked + .menu-button-container .menu-button {
    background: rgba(255, 255, 255, 0);
}
.top-nav #menu-toggle:checked ~ .menubgfull {
    -webkit-backdrop-filter: blur(15px);
    backdrop-filter: blur(15px);
    width: 100vh;
    height: 100vh;
    position: fixed;
    top: 140px;
    left: 0;
    right: 0;
}
</style>