> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lekalao.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Templates
> One shared layout, and campaigns that only fill in the content.
A template holds what does not change from one send to the next: header, logo, footer, address, unsubscribe link, styles. The campaigns and automation e-mails that use it only fill its **editable zone**.
## Create a template
**Templates → New template**, choose an editor (blocks, Markdown, HTML or MJML), then give it a name.
The editable zone is written:
```html theme={null}
{{ zone.main }}
```
In the block editor, it is the **Editable zone** block. While the template has none, a warning says so: without a zone, the campaigns' content appears nowhere.
### An example in HTML
```html theme={null}
```
Put the unsubscribe link and the postal address **in the template**: every
campaign that uses it is then in order, with nobody having to remember.
### Extra CSS
The **Extra CSS** field is folded into the e-mail as it is sent: the rules are copied into `style` attributes, and the media queries are kept in the header.
## Use a template
In the content editor of a campaign or an automation e-mail, choose it under **Template**. The preview shows the content inside the layout at once.
## Change or delete
Changing a template changes how the **next** sends of every campaign that uses it look. Campaigns already sent keep their content: deleting a template does not touch them.
The template list shows the editor, the editable zones it found and the date it was last changed.
