显示缩略图旁边的所有按钮

我需要创建lightSlider (http://sachinchoolur.github.io/lightslider/)画廊，那里有"显示所有照片"旁边的缩略图/。IsPager(如果缩略图计数>= 5显示按钮).

我尝试通过position: absolute来显示，但是显示所有按钮都在最后一个缩略图上。

$('#lightSlider').lightSlider({
  gallery: true,
  item: 1,
  loop: true,
  slideMargin: 0,
  thumbItem: 6
});

.demo {
  width: 420px;
  position: relative;
}
ul {
  list-style: none outside none;
  padding-left: 0;
  margin-bottom: 0;
}
li {
  display: block;
  float: left;
  margin-right: 6px;
  cursor: pointer;
}
img {
  display: block;
  height: auto;
  max-width: 100%;
}
.show-all {
  width: 80px;
  height: auto;
  background-color: #eee;
  border: 1px #ddd;
  float: left;
  position: absolute;
  right: 0;
  bottom: 0;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/lightslider/1.1.3/css/lightslider.min.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/lightslider/1.1.3/js/lightslider.min.js"></script>
<div class="demo">
  <ul id="lightSlider">
    <li data-thumb="http://sachinchoolur.github.io/lightslider/img/thumb/cS-1.jpg">
      <img src="http://sachinchoolur.github.io/lightslider/img/cS-1.jpg" />
    </li>
    <li data-thumb="http://sachinchoolur.github.io/lightslider/img/thumb/cS-2.jpg">
      <img src="http://sachinchoolur.github.io/lightslider/img/cS-2.jpg" />
    </li>
    <li data-thumb="http://sachinchoolur.github.io/lightslider/img/thumb/cS-3.jpg">
      <img src="http://sachinchoolur.github.io/lightslider/img/cS-3.jpg" />
    </li>
    <li data-thumb="http://sachinchoolur.github.io/lightslider/img/thumb/cS-4.jpg">
      <img src="http://sachinchoolur.github.io/lightslider/img/cS-4.jpg" />
    </li>
    <li data-thumb="http://sachinchoolur.github.io/lightslider/img/thumb/cS-5.jpg">
      <img src="http://sachinchoolur.github.io/lightslider/img/cS-5.jpg" />
    </li>
    <li data-thumb="http://sachinchoolur.github.io/lightslider/img/thumb/cS-6.jpg">
      <img src="http://sachinchoolur.github.io/lightslider/img/cS-6.jpg" />
    </li>
    <li data-thumb="http://sachinchoolur.github.io/lightslider/img/thumb/cS-7.jpg">
      <img src="http://sachinchoolur.github.io/lightslider/img/cS-7.jpg" />
    </li>
    <li data-thumb="http://sachinchoolur.github.io/lightslider/img/thumb/cS-8.jpg">
      <img src="http://sachinchoolur.github.io/lightslider/img/cS-8.jpg" />
    </li>
    <li data-thumb="http://sachinchoolur.github.io/lightslider/img/thumb/cS-9.jpg">
      <img src="http://sachinchoolur.github.io/lightslider/img/cS-9.jpg" />
    </li>
    <li data-thumb="http://sachinchoolur.github.io/lightslider/img/thumb/cS-10.jpg">
      <img src="http://sachinchoolur.github.io/lightslider/img/cS-10.jpg" />
    </li>
    <li data-thumb="http://sachinchoolur.github.io/lightslider/img/thumb/cS-11.jpg">
      <img src="http://sachinchoolur.github.io/lightslider/img/cS-12.jpg" />
    </li>
    <li data-thumb="http://sachinchoolur.github.io/lightslider/img/thumb/cS-13.jpg">
      <img src="http://sachinchoolur.github.io/lightslider/img/cS-13.jpg" />
    </li>
  </ul>
  <!-- show all is not part of thumnail list, but next to it -->
  <div class="show-all">
    <i class="fa fa-camera" aria-hidden="true"></i>
    <span>Show all photos</span>
  </div>
</div>

分页需要在中间对齐。