<div>
<ul class="list">
<li>カードリスト1</li>
<li>カードリスト2</li>
<li></li>
</ul>
</div>
.list {
display: flex;
justify-content: center;
padding: 0px;
}
.list li {
list-style: none;
width: 30%;
background-color: #ddd;
margin: 0 10px;
padding: 10px;
min-height:200px;
}
.list li:empty {
background: white url(https://yatteq.com/wp-content/uploads/2018/12/empty.jpg) no-repeat center center;
border:1px solid #ddd;
}
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