Just a pure CSS grid weighing in at 1.6Kb.
Standard 12 grid layout you find with almost all CSS frameworks that probably started with bootstrap css.
Like bootstrap the classes are the same. Wrap in a container and inner rows leading to columns.
There is only col-md-(1 to 12) and col-sm-(1 to 12). The reason for the same class names as bootstrap is to enable you to replace the full bootstrap later if you wanted.
<div class="container">
<div class="row">
<div class="col-md-4">
</div>
<div class="col-md-8">
</div>
</div>
</div>
Checkout the quilk-css-grid.scss for more the scss code.
The following variables you can override, and here are their defaults:
$container_width: 90% !default;
$width: 96% !default;
$gutter: 4% !default;
$breakpoint-small: 33.75em !default; // 540px
$breakpoint-med: 45em !default; // 720px
$breakpoint-large: 60em !default; // 960px