<div class="wrap">  <p>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</p>
<p>bbbbbbbbbbbbbbbb</p>
<p>cccccccccccccccccccccccccccccccccccccc</p>
</div>

* {
  box-sizing: border-box;
  word-break: break-all;
}
body {
  min-height: 100vh;
  margin: 0;
  padding: 10px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.wrap::after { content: "";display: block;clear: both; }
.wrap p {
  width: 30%;
  background: #eee;
  padding: 15px;
  margin: auto;
  float: left;
}
.wrap p:not(:nth-child(3n)) {
  margin-right: 5%;
}