webext-base-css/webext-base.css

Extremely minimal stylesheet/setup for Web Extensions’ options pages (also dark mode)

/*! https://npm.im/webext-base-css */

:root {
	color-scheme: light dark;
	max-width: 700px;
	margin: auto;
	background: var(--background-color);
}

body {
	/* Must be on body because both browsers have `font-size: 75%` here */
	font: 16px/1.5 system-ui, sans-serif;
}

select,
textarea,
input:where(
	[type='number'],
	[type='password'],
	[type='search'],
	[type='text'],
	[type='url'],
	:not([type])
) {
	box-sizing: border-box;
	font: inherit;
	line-height: 2;
}

textarea,
input:where(
	[type='number'],
	[type='password'],
	[type='search'],
	[type='text'],
	[type='url'],
	:not([type])
):not([size]) {
	width: 100%;
}

textarea {
	line-height: 1.5; /* Reset it because 2 is too big */
	resize: vertical;
	min-height: 3lh;
	/* stylelint-disable-next-line property-no-unknown */
	field-sizing: content;
}

input[type='submit'],
button {
	font: inherit;
}

hr {
	border: none;
	border-bottom: 1px solid currentcolor;
	opacity: 50%;
}

img {
	vertical-align: middle;
}

kbd {
	display: inline-block;
	padding: 3px 5px;
	font-size: 0.8em;
	line-height: 10px;
	color: #444d56;
	vertical-align: middle;
	background-color: #fafbfc;
	border: 1px solid #d1d5da;
	border-radius: 6px;
	box-shadow: inset 0 -1px 0 #d1d5da;
}

/* Firefox-only style */
/* stylelint-disable-next-line at-rule-no-vendor-prefix */
@-moz-document url-prefix('') {
	@media (prefers-color-scheme: dark) {
		:root {
			--background-color: #23222b;
		}
	}
}

/* iOS/iPadOS-specific style */
@supports (-webkit-text-size-adjust: none) {
	@media (prefers-color-scheme: dark) {
		:root {
			/* Safari iOS has a black background */
			--background-color: #1e1e1e;
		}
	}
}

.text-monospace,
.monospace-field {
	/* Same as GitHub style for `code` */
	font-family:
		ui-monospace,
		SFMono-Regular,
		'SF Mono',
		Menlo,
		Consolas,
		'Liberation Mono',
		monospace !important;
}

:root.webext-base-css-modal {
	background: light-dark(#6e9d9f, #194041);
	min-height: 100vh;
	display: grid;
	place-items: center;

	body {
		max-width: 500px;
		border-radius: 8px;
		padding: 8px;
		background: var(--background-color, light-dark(#fff, #1e1e1e));
		box-shadow:
			0.3px 2.8px 2.2px rgb(0 0 0 / 2%),
			0.8px 6.7px 5.3px rgb(0 0 0 / 2.8%),
			1.5px 12.5px 10px rgb(0 0 0 / 3.5%),
			2.7px 22.3px 17.9px rgb(0 0 0 / 4.2%),
			5px 41.8px 33.4px rgb(0 0 0 / 5%),
			12px 100px 80px rgb(0 0 0 / 7%);
	}

	body > :first-child {
		margin-top: 0;
	}

	body > :last-child {
		margin-bottom: 0;
	}

	hr {
		margin-inline: -8px;
	}
}