The editor's Theme tab styles a link page. Every setting is a fixed choice or a colour — there's no CSS to write, and nothing you type reaches the page as code.

What you can set

Setting	Options
Background	A solid colour, or an image from your Files.
Accent	A colour, used for buttons and highlights.
Button shape	square, rounded, or pill.
Button fill	solid or outline.
Font	default, serif, mono, or rounded.
Avatar shape	circle or square.

Anything you leave unset falls back to the neutral default: rounded solid buttons, the default font, a circular avatar, and no background image.

Text colour is derived from your accent automatically so it stays readable — it isn't a setting.

Presets

Three one-click starting points are offered: neutral (the out-of-the-box look), coral, and noir. Picking one just fills in the individual settings — every field stays editable afterwards, and big doesn't remember which preset you started from.

Background images come from Files

You can't paste an image URL. A background image is picked from your Files library, and the asset has to be an image that finished processing. big serves it through a short-lived signed URL generated per page load.

That's deliberate: it keeps a link page from loading anything off a third-party host, and it means deleting the file from Files cleanly drops the background rather than leaving a broken image on your live page.

Colours

Colours are entered as 6-digit hex (#rrggbb). Other CSS colour forms — rgb(), named colours, gradients, custom properties — aren't accepted.