<div class="items">
  <div class="item"><span></span></div>
  <div class="item"><span></span></div>
  <div class="item"><span></span></div>
  <div class="item"><span></span></div>
  <div class="item"><span></span></div>
  <div class="item"><span></span></div>
  <div class="item"><span></span></div>
  <div class="item"><span></span></div>
  <div class="item"><span></span></div>
</div>

.items{
  display: flex;
  width: 300px;
  margin: 0 auto;
  flex-wrap: wrap;
  border: 1px solid green;
  padding: 20px;
  padding-bottom: 0
}

.item{
  width: 33.3333333%;
  margin-bottom: 20px;
}
span{
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: red;
  margin: auto;
}