# .css, .sass or .less

Let's see, as an example, the different ways you have to change the backgrounds image of the login page.

First let's [download a background image](https://coolbackgrounds.io/) an put it in our public directory:

<figure><img src="/files/rC5piwrrqHxoziEQLjra" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
If you wish to do so, you can hot swipe assets that you have placed into your public directory in your Keycloak instance files at:

**/opt/keycloak/themes/**[**\<name of your theme>**](/documentation/v10/configuration-options/themename.md)**/\<login|account>/resources/dist**

<img src="/files/Oo1HkqMcNunci0QYi7Lo" alt="" data-size="original">
{% endhint %}

Let's apply this image to the body using plain CSS

{% code title="src/login/main.css" %}

```css
body.kcBodyClass {
  background: url(/background.png) no-repeat center center fixed;
}
```

{% endcode %}

We import the StyleSheet:

<pre class="language-tsx" data-title="src/login/KcPage.tsx"><code class="lang-tsx"><strong>import "./main.css";
</strong>import { Suspense, lazy } from "react";
// ...
</code></pre>

Result (see [testing your theme](/documentation/v10/testing-your-theme.md)):

<figure><img src="/files/zXu7es2F39mKVobvkBZ9" alt=""><figcaption><p>Custom background successfully applied</p></figcaption></figure>

If you prefer, you can also move the background.png image from `public/` to, for examples, `src/login/assets/background.png` and reference the image with a path relative to the CSS file, in this case it would be:

{% code title="src/login/main.css" %}

```css
body.kcBodyClass {
  background: url(./assets/background.png) no-repeat center center fixed;
}
```

{% endcode %}

In the following video I show how to load different background for different page and how to create [theme variant](/documentation/v10/theme-variants.md).

{% embed url="<https://youtu.be/Nkoz1iD-HOA?si=hBXt8rw72-Pvhhnr>" %}


---

# Agent Instructions: 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:

```
GET https://doc-old.keycloakify.dev/documentation/v10/customization-strategies/css-level-customization/using-custom-assets/plain-css.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.