csstdg5figs/07-padding-borders-outlines-and-margins/borders_border-radius-simple-percentage.html at main · meyerweb/csstdg5figs · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>How percentage border radii are calculated</title>
<style type="text/css">
body {display: flex; justify-content: center;}
.arena p {font-size: 3em; border: 0.1em solid black; padding: 2em;
	box-sizing: border-box;
	border-radius: 33%;
	width: 14.4em;
	height: 5.4em;
	position: relative;
	background-color: silver; background-clip: content-box;}
.arena p b {position: absolute;
	width: calc(14.4em*0.33);
	height: calc(5.4em*0.33);
 	border: 0.1em solid rgba(255,192,0,0.5);
 	background-image:
		radial-gradient(circle at center, transparent 3.5em),
		linear-gradient(to left, black, black);
	background-repeat: no-repeat;
	background-size: 100% 100%, 50% 1px;
	display: flex;
	align-items: center;
	filter:
		drop-shadow(0 0 1px white)
		drop-shadow(0 0 1px white)
		drop-shadow(0 0 2px white)
		drop-shadow(0 0 3px white)
		;
	}
.arena p b.top {top: -0.1em; border-bottom-width: 0;}
.arena p b.bottom {bottom: -0.1em; border-top-width: 0;}
.arena p b.right {right: -0.1em; border-left-width: 0;
	background-position: center, center right;
	justify-content: end;
}
.arena p b.left {left: -0.1em; border-right-width: 0;
	background-position: center, center left;
	justify-content: start;
}

.arena p b i {	font: 0.5em Arvo, serif; position: absolute;
background: white; margin: 0; font-style: normal;}
.arena p b.top.left i:nth-child(1) {top: -1ch; left: 15%;}
.arena p b.top.left i:nth-child(2) {left: -2ch; top: 1ch;}
.arena p b.bottom.right i:nth-child(1) {bottom: -1ch; right: 15%;}
.arena p b.bottom.right i:nth-child(2) {right: -2ch; bottom: 1ch;}
</style>
</head>
<body>

<section class="arena">

<p>
My borders are rounded.
<b class="top left"><i>33%</i><i>33%</i></b>
<b class="bottom right"><i>33%</i><i>33%</i></b>
</p>

</section>

</body>
</html>