<div class="parent">
  <p class="child">I'm fatfish, 6 years of programming experience, like front-end, writing
    and making friends, looking forward to becoming good friends with you.</p>
</div>

* {
  margin: 0; 
  padding: 0;
}

body {
  padding: 15px;
  color: #324b64;
}

.parent {
  padding: 0 10px;
  background-color: #f5f6f9;
  height: 100px;
  border-radius: 6px;
  font-size: 12px;
  /* Key Style */
  display: flex;
  align-items: center;
  justify-content: center;
}