<div class="container align-items"><div class="content">Blah blah blah...</div></div>
<div class="container margin-auto"><div class="content">Blah blah blah...</div></div>
<div class="container margin-auto"><div class="content smaller">Blah blah blah...</div></div>

* {
  box-sizing: border-box;
}

.container {
  margin: 20px;
  padding: 20px;
  background: skyblue;
  height: calc(100vh - 40px);
  width: 25vw;
  float: left;
  display: flex;
  justify-content: center;
}

.align-items {
  align-items: center;
}

.margin-auto .content {
  margin: auto 0;
}

.content {
  height: 160%;
  width: 20vw;
  background: lightpink;
  padding: 10px;
}

.smaller {
  height: 40%;
}