Use the code given below:
html, body {
height: 100%;
}
body {
margin: 0;
}
.flex-container {
height: 100%;
padding: 0;
margin: 0;
display: -webkit-box;
display: -moz-box;
display: -ms-flexbox;
display: -webkit-flex;
display: flex;
align-items: center;
justify-content: center;
}
.row {
width: auto;
border: 1px solid blue;
}
.flex-item {
background-color: tomato;
padding: 5px;
width: 20px;
height: 20px;
margin: 10px;
line-height: 20px;
color: white;
font-weight: bold;
font-size: 2em;
text-align: center;
}
<div class="flex-container">
<div class="row">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
</div>
</div>
Have a look at this demo: http://jsfiddle.net/audetwebdesign/tFscL/
If you want the height and top/bottom padding to work properly then the .flex-item elements should be block-level (div instead of span). Also, on .row, set the width to auto instead of 100%. Your .flex-container properties are fine.
Assign 100% height to HTML and body, and also zero out the body margins, if you want the .row to be centered vertically in the viewport.
Note that the .flex-container should have a height to see the vertical alignment effect, otherwise, the container will compute the minimum height needed to
enclose the content, which will be less than the viewport height in the example.
Note: The flex-flow, flex-direction, flex-wrap properties can make this design easier to implement. The .row container will not be needed unless you want to add some styling around the elements (background image, borders and so on).
For more information, have a look at this document: http://demo.agektmr.com/flexbox/
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