SOURCE

<div class="wrapper">
  <ul class="list-group">
    <li class="list-group-item">1</li>
    <li class="list-group-item">2</li>
    <li class="list-group-item">3</li>
    <li class="list-group-item">4</li>
    <li class="list-group-item">5</li>
    <li class="list-group-item">6</li>
    <li class="list-group-item">7</li>
    <li class="list-group-item">8</li>
    <li class="list-group-item">9</li>
    <li class="list-group-item">10</li>
  </ul>
</div>

* {
  margin: 0;
  padding: 0
}

ul {
  list-style: none;
}

.wrapper {
  width: 200px;
  margin-top: 20px;
  margin-left: 20px;
  margin-bottom: 20px;
}
.list-group-item {
  padding: 10px 5px;
  border: 1px solid #ddd;
  margin-bottom: -1px;
}

.list-group-item:first-child {
  border-top-left-radius: 4px;
  border-top-right-radius: 4px;
}

.list-group-item:last-child {
  margin-bottom: 0;
  border-bottom-left-radius: 4px;
  border-bottom-right-radius: 4px;
}