Cacher is the code snippet organizer for pro developers

.container {
  height: 100px;
  background: #7396a1;
  color: #fff;
  width: 300px;
  margin-left: auto;
  margin-right: auto;
}

.content {
  text-align: center;
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}

<div class="container">
  <div class="content">I'm aligned vertically!</div>
</div>