Accordion Menu with Dropdown Using HTML, CSS and JS

index.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" />

    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css" />

    <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Montserrat" />

    <link rel="stylesheet" href="css/style.css" />

    <title>Accordion Menu</title>
  </head>

  <body>
    <div class="container">
      <ul class="accordion-menu">
        <li>
          <div class="dropdownlink">
            <i class="fa fa-heart" aria-hidden="true"></i> Accordion

            <i class="fa fa-chevron-down" aria-hidden="true"></i>
          </div>

          <ul class="submenuItems">
            <li><a href="#">Accordion 1</a></li>

            <li><a href="#">Accordion 2</a></li>

            <li><a href="#">Accordion 3</a></li>
          </ul>
        </li>

        <li>
          <div class="dropdownlink">
            <i class="fa fa-heart" aria-hidden="true"></i> Accordion

            <i class="fa fa-chevron-down" aria-hidden="true"></i>
          </div>

          <ul class="submenuItems">
            <li><a href="#">Accordion 1</a></li>

            <li><a href="#">Accordion 2</a></li>

            <li><a href="#">Accordion 3</a></li>
          </ul>
        </li>

        <li>
          <div class="dropdownlink">
            <i class="fa fa-heart" aria-hidden="true"></i> Accordion

            <i class="fa fa-chevron-down" aria-hidden="true"></i>
          </div>

          <ul class="submenuItems">
            <li><a href="#">Accordion 1</a></li>

            <li><a href="#">Accordion 2</a></li>

            <li><a href="#">Accordion 3</a></li>
          </ul>
        </li>

        <li>
          <div class="dropdownlink">
            <i class="fa fa-heart" aria-hidden="true"></i> Action

            <i class="fa fa-chevron-down" aria-hidden="true"></i>
          </div>

          <ul class="submenuItems">
            <li><a href="#">Action 1</a></li>

            <li><a href="#">Action 2</a></li>

            <li><a href="#">Action 3</a></li>
          </ul>
        </li>
      </ul>
    </div>

    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>

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

style.css

* {
     margin: 0;
     padding: 0;
}
 body {
     font-family: "Montserrat", sans-serif;
     background-color: #f7b42c;
     background-image: linear-gradient(315deg, #f7b42c 0%, #fc575e 74%);
}
 .lead {
     font-size: 1.5rem;
     font-weight: 300;
}
 .container {
     margin: 150px auto;
     max-width: 960px;
}
 ul {
     list-style: none;
}
 a {
     text-decoration: none;
}
 h2 {
     text-align: center;
     margin: 20px auto;
     color: #fff;
}
 .accordion-menu {
     width: 100%;
     max-width: 450px;
     margin: 60px auto 20px;
     background: #fff;
     border-radius: 4px;
}
 .accordion-menu li.open .dropdownlink {
     color: #f7b42c;
}
 .accordion-menu li.open .dropdownlink .fa-chevron-down {
     transform: rotate(180deg);
}
 .accordion-menu li:last-child .dropdownlink {
     border-bottom: 0;
}
 .dropdownlink {
     cursor: pointer;
     display: block;
     padding: 15px 15px 15px 45px;
     font-size: 18px;
     border-bottom: 1px solid #ccc;
     color: #212121;
     position: relative;
     transition: all 0.4s ease-out;
}
 .dropdownlink i {
     position: absolute;
     top: 17px;
     left: 16px;
}
 .dropdownlink .fa-chevron-down {
     right: 12px;
     left: auto;
}
 .submenuItems {
     display: none;
     background: #ffe5d9;
}
 .submenuItems li {
     border-bottom: 1px solid #f5c4c6;
}
 .submenuItems a {
     display: block;
     color: #727272;
     padding: 12px 12px 12px 45px;
     transition: all 0.4s ease-out;
}
 .submenuItems a:hover {
     background: #ffa47a;
     color: #fff;
}

main.js

$(function ()
{
    var Accordion = function (el, multiple)
    {
        this.el = el ||
        {};
        //More Than One Menu Open
        this.multiple = multiple || false;
        var dropdownlink = this.el.find('.dropdownlink');
        dropdownlink.on('click',
        {
            el: this.el,
            multiple: this.multiple
        }, this.dropdown);
    };
    Accordion.prototype.dropdown = function (e)
    {
        var $el = e.data.el,
            $this = $(this),
            $next = $this.next();
        $next.slideToggle();
        $this.parent().toggleClass('open');
        if (!e.data.multiple)
        {
            //Show Only one Menu at the same time
            $el.find('.submenuItems').not($next).slideUp().parent().removeClass('open');
        }
    };
    var accordion = new Accordion($('.accordion-menu'), false);
});