Scrolling shadows by @kizmarh and @LeaVerou

dabblet.css

/**
 * Scrolling shadows by @kizmarh and @leaverou
 * Only works in browsers supporting background-attachment: local; & CSS gradients
 * Degrades gracefully
 */

html {
	background: white;
	font: 120% sans-serif;
}

.scrollbox {
	overflow-x: scroll;
	overflow-y: hidden;
	max-width: 400px;
	height: 200px;
	margin: auto;

	background:
		/* Shadow covers */
		linear-gradient(left, white 30%, rgba(255,255,255,0)),
		linear-gradient(left, rgba(255,255,255,0), white 70%),
		
		/* Shadows */
		radial-gradient( 0 50%, farthest-side, rgba(0,0,0,.2), rgba(0,0,0,0)),
		radial-gradient(100% 50%,farthest-side, rgba(0,0,0,.2), rgba(0,0,0,0)) 0 100%;
	background-repeat: no-repeat;
	background-position: left, right, left, right;
	background-color: white;
	/* width height */
	background-size:40px 100%, 40px 100%, 14px 100%, 14px 100%;
	
	/* Opera doesn't support this in the shorthand */
	background-attachment: local, local, scroll, scroll;
}

.scrollbox ul {
	list-style: none;
	width: 1000px;
	margin-left: 0;
}
.scrollbox li{
	display: inline-block;
}

dabblet.html

<h1>CSS-only shadow-scrolling effect.</h1>



<div class="scrollbox">
	<ul>
		<li>Ah! Scroll below!</li>
		<li>2</li>
		<li>3</li>
		<li>4</li>
		<li>5</li>
		<li>6</li>
		<li>7</li>
		<li>8</li>
		<li>9</li>
		<li>10</li>
		<li>1</li>
		<li>2</li>
		<li>3</li>
		<li>4</li>
		<li>5</li>
		<li>6</li>
		<li>7</li>
		<li>8</li>
		<li>9</li>
		<li>10</li>
		<li>1</li>
		<li>2</li>
		<li>3</li>
		<li>4</li>
		<li>5</li>
		<li>6</li>
		<li>7</li>
		<li>8</li>
		<li>The end!</li>
		<li>No shadow there.</li>
	</ul>
</div>

settings.json

{"view":"separate","fontsize":"100","seethrough":"","prefixfree":"1","page":"all"}