CSS, плавающий с перекрытием

$(function() {
  $("[data-close]").click(function(e) {
    const dataClose = $(this).attr("data-close");
    const elem = $('[data-id="' + dataClose + '"]').length ?
      $('[data-id="' + dataClose + '"]') :
      $(dataClose);
    if (elem.hasClass("active") && elem.is(":visible")) {
      elem.removeClass("active");
      e.stopImmediatePropagation();
    }
  });

  $("body").not(".active").click(function(e) {
    console.log("body click");
    $(".active").removeClass("active");
  });

  $(".button").click(function(e) {
    var el = $(".modal[data-id='" + $(this).attr("id") + "']");
    console.log($(this).attr("id") + " clicked, remove class 'active' from all. Add 'active' to ", el);
    $(".active").removeClass("active");
    el.addClass("active");
    console.log(el);
    e.stopPropagation();
  });
});

.buttons {
  display: flex;
  align-items: center;
}

.button {
  height: 30px;
  cursor: pointer;
  border: 2px solid;
  padding: 1rem;
  font-size: 28px;
}

#icon {
  color: silver;
}

.header {
  height: 15px;
  background: #eee;
}

.modal {
  position: fixed;
  top: 72px;
  right: 15px;
  z-index: 6;
  opacity: 0;
  visibility: hidden;
  transform: scale(0.5);
  transform-origin: top right;
  transition: 0.15s;
  box-shadow: 0 1.5px 4px rgba(0, 0, 0, 0.24), 0 1.5px 6px rgba(0, 0, 0, 0.12);
}

.modal:after {
  content: "";
  width: 15px;
  height: 15px;
  background: inherit;
  position: absolute;
  background: #eee;
  top: -6px;
  right: 8px;
  opacity: 0;
  visibility: hidden;
  transform: rotate(45deg) scale(0.5);
  transition: 0.15s;
}

.modal.active {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
}

.modal.active:after {
  opacity: 1;
  visibility: visible;
  transform: rotate(45deg) scale(1);
}

<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.6.3/css/all.css" integrity="sha384-UHRtZLI+pbxtHCWp1t77Bi1L4ZtiqrqD80Kn4Z8NTSRyMA2Fd33n5dQ8lWUE00s/" crossorigin="anonymous">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="buttons">
  <img src="https://www.dignitasteam.com/wp-content/uploads/2015/09/3050613-inline-i-2-googles-new-logo-copy.png" class="button" id="google" data-close="google" />
  <img src="https://www.arabianbusiness.com/sites/default/files/styles/full_img/public/images/2017/01/17/apple-logo-rainbow.jpg" class="button" id="apple" data-close="apple" />
  <div class="button" id="icon" data-close="icon">
    <i class="fas fa-bell"></i>
  </div>
</div>

<div class="modal" data-id="google">
  <div class="header">Google</div>
  <ul>
    <li>First</li>
    <li>Second</li>
    <li>Third</li>
  </ul>
</div>
<div class="modal apple-modal" data-id="apple">
  <div class="header">Apple</div>
  <ul>
    <li>First</li>
    <li>Second</li>
    <li>Third</li>
  </ul>
</div>
<div class="modal" data-id="icon">
  <div class="header">Icon</div>
  <ul>
    <li>First</li>
    <li>Second</li>
    <li>Third</li>
  </ul>
</div>