Flexible CSS3 Flexbox Grid System
<div class="row">
<div class="col">
content
</div>
</div>
<div class="row">
<div class="col">content</div>
<div class="col">content</div>
<div class="col">content</div>
</div>
<div class="row">
<div class="col col--lg70">content 70%</div>
<div class="col col--lg30">content 30%</div>
</div>
<div class="row">
<div class="col col--md20">content 20%</div>
<div class="col col--md80">content 80%</div>
</div>
<div class="row">
<div class="col col--fixed200">content 200px fixed</div>
<div class="col">content</div>
</div>