<div class="container">
  <div class="item">
    Item 1
  </div>
  <div class="item">
    Item 2
  </div>
  <div class="item">
    Item 3
  </div>
</div>
 

html, body { 
  height: 100%;
}

.container {
  display: flex;
  justify-content: space-around;
  align-items: center;
  height: 100%;
  background-color: #FFF2CC;
  
}

.item {
  background-color: #FFD966;
  padding: 50px;
}