JSFiddle - React, Tailwind, and code Playground

HTML

<div class="content">
<p>
<select size="6" multiple class="block-select">
<option disabled>Выберите блок</option>
<option value=".block-1">block-1</option>
<option selected value=".block-2">block-2</option>
<option value=".block-11">block-11</option>
<option value=".block-101">block-101</option>
<option value=".block-301">block-301</option>
</select>
</p>
<div class="block-1">1</div>
<div class="block-2">2</div>
<div class="block-11">11</div>
<div class="block-101">101</div>
<div class="block-301">301</div>

</div>

CSS

div {
  display: inline-block;
  width: 100px;
  height: 100px;
  margin: 20px;
  text-align: center;
  line-height: 100px;
}
.block-1,
.block-2,
.block-11,
.block-101,
.block-301 {
box-shadow: 10px 20px 30px gray;
height: 100px;
}
.content {
  display: block;
  display: flex;
  display: -webkit-flex;
  width: 96%;
  height: 300px;
  background: #fafafa;
}
.block-select {
  border: 0;
  outline: none;
}