<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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