> For the complete documentation index, see [llms.txt](https://help.brickspacelab.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.brickspacelab.com/slab/advanced-customizations/theme-architecture/styling/utility-classes/borders.md).

# Borders

`src/css/utilities/borders.css`

Theme-aware border width and radius utilities that read from CSS custom properties, plus standardised focus ring patterns. Use these instead of hardcoding pixel values for borders and radii so they automatically reflect merchant style settings.

## Border width

**Element**

| Class             | Sets                                                    |
| ----------------- | ------------------------------------------------------- |
| `outline--width`  | Outline width + solid style — `--border__width-element` |
| `border--width`   | All sides — `--border__width-element`                   |
| `border--t-width` | Top only — `--border__width-element`                    |
| `border--r-width` | Right only — `--border__width-element`                  |
| `border--b-width` | Bottom only — `--border__width-element`                 |
| `border--l-width` | Left only — `--border__width-element`                   |

**Button**

| Class                    | Sets                                   |
| ------------------------ | -------------------------------------- |
| `border--button-width`   | All sides — `--border__width-button`   |
| `border--t-button-width` | Top only — `--border__width-button`    |
| `border--r-button-width` | Right only — `--border__width-button`  |
| `border--b-button-width` | Bottom only — `--border__width-button` |
| `border--l-button-width` | Left only — `--border__width-button`   |

**Input**

| Class                   | Sets                                     |
| ----------------------- | ---------------------------------------- |
| `border--input-width`   | All sides — `--size__border-input-width` |
| `border--t-input-width` | Top — `--input__border-width-top`        |
| `border--r-input-width` | Right — `--input__border-width-right`    |
| `border--b-input-width` | Bottom — `--input__border-width-bottom`  |
| `border--l-input-width` | Left — `--input__border-width-left`      |
| `border--input-padding` | Horizontal padding — `--input__padding`  |

## Border radius

| Class              | Sets                                                    |
| ------------------ | ------------------------------------------------------- |
| `border--radius`   | All corners — `--border__radius-element`                |
| `border--t-radius` | Top-left + top-right — `--border__radius-element`       |
| `border--b-radius` | Bottom-left + bottom-right — `--border__radius-element` |
| `border--l-radius` | Top-left + bottom-left — `--border__radius-element`     |
| `border--r-radius` | Top-right + bottom-right — `--border__radius-element`   |

## Focus styles

| Class                      | Style                                                                  |
| -------------------------- | ---------------------------------------------------------------------- |
| `border--focus`            | Solid outline using `--input__focus-width` and `--input__focus-border` |
| `border--focus--inset`     | 2px inset box-shadow focus ring with body-bg outline                   |
| `border--focus--outset`    | 4px outset box-shadow focus ring with body-bg outline                  |
| `border--focus--offset`    | 2px outline with `outline-offset: 2`                                   |
| `border--focus--simple`    | Inset 1px box-shadow, no outline                                       |
| `border--focus--underline` | Underline only, no outline or shadow                                   |
| `border--focus--none`      | Removes all border, outline, and shadow                                |

## Button border presets

Composite classes that apply the appropriate border widths, focus rings, and radii for buttons:

| Class                    | Applies                                           |
| ------------------------ | ------------------------------------------------- |
| `border__button`         | `border--button-width`                            |
| `border__button--focus`  | `color-br__input--focus` + `border--focus--inset` |
| `border__button--radius` | `--border__radius-button`                         |

## Input border presets

Composite classes that apply the appropriate border widths, focus rings, and radii for inputs:

| Class                      | Applies                                                    |
| -------------------------- | ---------------------------------------------------------- |
| `border__input`            | All four input border widths (top / right / bottom / left) |
| `border__input--focus`     | `border--focus--inset`                                     |
| `border__input--radius`    | `--border__radius-input`                                   |
| `border__textarea--radius` | `--border__radius-textarea`                                |

## Miscellaneous

| Class          | Effect                                                                               |
| -------------- | ------------------------------------------------------------------------------------ |
| `shadow--blur` | Diffuse drop shadow: `0px 0px 100px 10px rgb(0 0 0 / 0.3)`                           |
| `anglethrough` | Diagonal strikethrough line via a pseudo-element using `--color__background-shade-3` |


---

# 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.brickspacelab.com/slab/advanced-customizations/theme-architecture/styling/utility-classes/borders.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.