Bootstrap 4 Grid System
Bootstrap's grid system is built with flexbox and allows up to 12 columns across the page.
If you do not want to use all 12 columns individually, you can group the columns together to create wider columns:
Grid Classes
The Bootstrap 4 grid system has five classes:
.col-(extra small devices - screen width less than 576px).col-sm-(small devices - screen width equal to or greater than 576px).col-md-(medium devices - screen width equal to or greater than 768px).col-lg-(large devices - screen width equal to or greater than 992px).col-xl-(xlarge devices - screen width equal to or greater than 1200px)
The classes above can be combined to create more dynamic and flexible layouts.
Tip: Each class scales up, so if you wish to set the same widths for sm and md, you only need to specify sm.
Basic Structure of a Bootstrap 4 Grid
The following is a basic structure of a Bootstrap 4 grid:
<!-- Control the column width, and how they should appear on different devices -->
<div class="row">
<div class="col-*-*"></div>
<div class="col-*-*"></div>
</div>
<div class="row">
<div class="col-*-*"></div>
<div class="col-*-*"></div>
<div class="col-*-*"></div>
</div>
<!-- Or let Bootstrap automatically handle the layout -->
<!-- Below code will result in 3 equal columns -->
<div class="row">
<div class="col"></div>
<div class="col"></div>
<div class="col"></div>
</div>
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