div:nth-child(1) {
	border-radius: 50%; /* Relative to size.*/
	border-style: solid;

div:nth-child(2) {
	background-color: deepskyblue;
	border-radius: 10px; /* Absolute amount. */

div:nth-child(3) {
	background-color: gold;
	border-bottom-right-radius: 25px;
	border-top-left-radius: 25px;

/* Same as before. */
body {
	font-family: sans-serif;
	padding: 20px;

div { padding: 20px; }

/* Every one but the first one. */
div:not(:first-child) { margin-top: 20px; }
<!DOCTYPE html>
		<title>Border radius</title>
		<link href="/assets/styles/reset.css" rel="stylesheet">
		<link href="style.css" rel="stylesheet">
			<p>Unlike margin and padding, borders can be rounded.</p>
			<p>This is often used in combination with a background.</p>
			<p>It can also only adjust specific corners!</p>