Using consistent margins for tips and code blocks.
diff --git a/docs/extra.less b/docs/extra.less
index 62ff695..9d0ce97 100644
--- a/docs/extra.less
+++ b/docs/extra.less
@@ -322,6 +322,7 @@
 	border-radius:4px;
 	padding:1em;
 	text-shadow:0 1px 1px hsl(0,0%,100%);
+	margin:1em 0;
 }
 
 .note a,.pre a,.post a,.invariant a,.warning a,.attention a,.deprecated a,.bug a,.todo a,.test a,.note a:visited,.pre a:visited,.post a:visited,.invariant a:visited,.warning a:visited,.attention a:visited,.deprecated a:visited,.bug a:visited,.todo a:visited,.test a:visited {
@@ -339,6 +340,7 @@
 	padding:1em;
 	overflow:auto;
 	border-left:4px solid hsl(0,0%,80%);
+	margin:1em 0;
 }
 
 .lineno a,.lineno a:visited,.line,pre.fragment {