[html css jquery] Mobile menu + button change from burger to close + close on backdrop click

Here is the basis for creating a menu with a hamburger button that changes to close when the menu is open. In addition, there is a background on top of the content. You can close the menu by clicking on the background.

codepen example: https://codepen.io/ktr92/pen/gOBRyKO

HTML:

<div class="jsbackdrop"></div>

<div class="container">
  <header class="header">
    <div class="flex items-center space-between w-full">
      <div class="headercontent">HEADER</div>
      <a href="#" class="menubtn" data-menutoggle="mainmenu">
        <span></span>
        <span></span>
        <span></span>
      </a>
    </div>

    <div class="mainmenu" data-menu="mainmenu">
      <div class="mainmenu__wrapper">
        <div class="mainmenu__items">
          <ul>
            <li class="active"><a href="#">Home</a></li>
            <li><a href="#">Page 1</a></li>
            <li><a href="#">Page 2</a></li>
            <li><a href="#">Page 3</a></li>
            <li><a href="#">Page 4</a></li>
            <li><a href="#">Page 5</a></li>
          </ul>
        </div>
      </div>
    </div>
  </header>
  <main>
    content body
  </main>
</div>

CSS:

[data-menutoggle] {
  display: block;
  margin-left: 15px;
}

[data-menutoggle] span {
  width: 32px;
  height: 3px;
  margin-bottom: 5px;
  display: block;
  background: #324064;
  transform-origin: 4px 0px;
  transition: transform 0.3s cubic-bezier(0.77, 0.2, 0.05, 1),
    background 0.5s cubic-bezier(0.77, 0.2, 0.05, 1), opacity 0.55s ease;

  &:last-child {
    margin-bottom: 0;
  }
}

[data-menutoggle] span:first-child {
  transform-origin: 0% 0%;
}

[data-menutoggle] span:last-child {
  transform-origin: 0% 100%;
}

[data-menutoggle].active span:first-child {
  opacity: 1;
  transform: translate(0, 18px) rotate(-45deg);
}

[data-menutoggle].active span:last-child {
  transform: translate(0, -21px) rotate(45deg);
}

[data-menutoggle].active span:nth-child(2) {
  opacity: 0;
}
[data-menu] {
  display: none;
}
[data-menu].active {
  display: block;
}

.jsbackdrop {
  background: rgba(52, 60, 75, 0.5);
  display: none;
  position: fixed;
  z-index: 9;
  height: 100%;
  min-height: 100vh;
  left: 0;
  top: 0;
  width: 100%;
}

.jsbackdrop.active {
  display: block;
}
.mainmenu {
  width: 100%;
  position: absolute;
  background: #fff;
  z-index: 99;
  left: 0;
  padding: 10px;
  top: 100%;
}
.mainmenu li {
  list-style: none;
  margin-bottom: 5px;
}

JS[jquery]:

$("[data-menutoggle]").on("click", function (e) {
  e.preventDefault();
  let menu = $(this).data("menutoggle");
  $(`[data-menu=${menu}]`).toggleClass("active");
  $(this).toggleClass("active");
  $(".jsbackdrop").toggleClass("active");
});
$(".jsbackdrop").on("click", function (e) {
  $(this).removeClass("active");
  $("[data-menu]").removeClass("active");
  $("[data-menutoggle]").removeClass("active");
});