> For the complete documentation index, see [llms.txt](https://help.sdocs.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.sdocs.com/sdocs/template-architecture/images-in-s-docs/dynamic-image-solutions/insert-field-image-resize.md).

# How to: Use a CSS Selector

CSS Styling for an image within a custom field. Useful for dynamic images that are various sizes.

Use a selector to set dimensions for specific HTML entities such as `div.class1 img`

{% code title="template.html" %}

```html
<style type="text/css">div.class1{
  max-width: 400px;
  max-height: 400px
}

div.class1 img {
  width: 100%;
  height: 100%;
}
</style>
<div class="class1">{{{!Objectname.fieldname}}}</div>
```

{% endcode %}

### Understanding the Source

In the above code block we provide our \<div> with a class **class1.**

```
<div class="class1">{{{!Objectname.fieldname}}}</div>
```

The template is being populated with an image stored in a field, meaning we have a rich text field that will require 3 curly braces. The Selector will set the width and height of any image \<img> to its full value that is found within a \<div> with class **class1.**

<figure><img src="/files/ZPULNhlIJUnfwaZVKACF" alt=""><figcaption></figcaption></figure>


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://help.sdocs.com/sdocs/template-architecture/images-in-s-docs/dynamic-image-solutions/insert-field-image-resize.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.