【jQuery】シンプルでカスタマイズしやすいモーダルウィンドウを作ってみた

<a href="javascript:void()" data-target="modal-01" class="js-modal-open">モーダルを開く</a>
<div id="modal-01" class="modal js-modal">
  <div class="modal-bg js-modal-close"></div>
  <div class="modal-content">
    <div class="modal-inner">
    モーダルの中身です。
    </div>
    <a href="javascript:void()" class="js-modal-close btn_close">×</a>
  </div>
</div>

$(function(){
  var modal_open  = $('.js-modal-open');
  var modal_close = $('.js-modal-close');

  modal_open.on('click', function(){
    var target = $(this).data('target');
    var modal  = document.getElementById(target);
    $(modal).fadeIn();
    $('html, body').css('overflow-y', 'hidden');
    return false;
  });

  modal_close.on('click', function(){
    $('.js-modal').fadeOut();
    $('html, body').css('overflow-y', 'auto');
    return false;
  });
});

/* Modal Base */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  width: 100%;
  z-index: 100;
}
.modal-bg {
  position: absolute;
  height: 100vh;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 101;
}

/* Modal Content */
.modal-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  z-index: 102;
}
@media screen and (max-width: 640px) {
  .modal-content {
    width: 80vw;
  }
}
.modal-inner {
  position: relative;
  background: white;
  width: 100%;
  min-height: 100px;
  max-height: 500px;
  padding: 30px;
  overflow-x: hidden;
  overflow-y: auto;
}

/* Close Button */
.btn_close {
  display: block;
  position: absolute;
  top: -50px;
  right: 0;
  background-color: white;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  color: black;
  text-align: center;
  font-size: 30px;
  text-decoration: none;
  line-height: 35px;
  z-index: 105;
}