@layer demo {
	@layer baselayout {
		* {
			box-sizing: border-box;
		}

		html {
			color: #444;
			background: #cfcfcf;
		}

		body {
			font-size: 16px;
			font-family: -system-ui, sans-serif;
			line-height: 1.5;
			margin: 0;
			padding: 2em;
			-webkit-font-smoothing: antialiased;

			display: grid;
			place-content: safe center;
			height: 100%;
			gap: 2rem;
		}

		html,
		body {
			height: 100%;
		}

		main {
			display: flex;
			gap: 2rem;
			margin: 0 auto;
			text-align: center;
		}
	}

	@layer ui {
		.container {
			height: 250px;
			width: 250px;
			overflow-y: auto;
			padding: 0 1em;
			position: relative;
			background: #fff;
			margin: auto;
			border-radius: 0.3em;
			box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
		}

		.container::before,
		.container::after {
			content: '';
			display: block;
			position: sticky;
			left: 0em;
			right: 0em;
			height: 0.75rem;

			visibility: hidden;
		}

		.container::before {
			top: 0;
			background: radial-gradient(farthest-side at 50% 0, rgb(0 0 0 / 0.25), rgb(0 0 0 / 0));
		}

		.container::after {
			bottom: 0;
			background: radial-gradient(farthest-side at 50% 100%, rgb(0 0 0 / 0.25), rgb(0 0 0 / 0));
			animation-direction: reverse;
			animation-range: calc(100% - 40px) calc(100% - 20px);
		}

		.container > *:first-child {
			margin-top: 0;
		}
		.container > *:last-child {
			margin-bottom: 0;
		}
	}
}