How to centre div horizontally, and vertically within the container using flexbox. In the below example, I want each number below each other (in rows), which are centred horizontally.
.flex-container {
padding: 0;
margin: 0;
list-style: none;
display: flex;
align-items: center;
justify-content: center;
}
row {
width: 100%;
}
.flex-item {
background: tomato;
padding: 5px;
width: 200px;
height: 150px;
margin: 10px;
line-height: 150px;
color: white;
font-weight: bold;
font-size: 3em;
text-align: center;
}
<div class="flex-container">
<div class="row">
<span class="flex-item">1</span>
</div>
<div class="row">
<span class="flex-item">2</span>
</div>
<div class="row">
<span class="flex-item">3</span>
</div>
<div class="row">
<span class="flex-item">4</span>
</div>
</div>