[css-position-4][editorial] Algo styles

Author: tabatkins

css-position-4/Overview.bs

@@ -18,6 +18,24 @@ spec:css-break-4; type:dfn; text:fragment
 spec:dom; type:dfn; for:/; text:element
 </pre>
 
+<style>
+/* Put nice boxes around each algorithm. */
+[data-algorithm]:not(.heading) {
+	padding: .5em;
+	border: thin solid #ddd; border-radius: .5em;
+	margin: .5em calc(-0.5em - 1px);
+}
+[data-algorithm]:not(.heading) > :first-child {
+	margin-top: 0;
+}
+[data-algorithm]:not(.heading) > :last-child {
+	margin-bottom: 0;
+}
+[data-algorithm] [data-algorithm] {
+	margin: 1em 0;
+}
+</style>
+
 Introduction {#intro}
 =====================