mj-group allows you to prevent columns from stacking on mobile. To do so, wrap the columns inside a `mj-group` tag, so they'll stay side by side on mobile.
```xml
Easy and quick
Write less code, save time and code more efficiently with MJML’s semantic syntax.
Responsive
MJML is responsive by design on most-popular email clients, even Outlook.
```
attribute | unit | description | default attributes
--------------------|-------------|--------------------------------|--------------------------------------
width | percent/px | group width | (100 / number of non-raw elements in section)%
vertical-align | string | middle/top/bottom | top
background-color | string | background color for a group | n/a
direction | ltr / rtl | set the display order of direct children | ltr
css-class | string | class name, added to the root HTML element created | n/a