Add superscript and subscript formatting.

static/css/screen.css

@@ -167,11 +167,29 @@ div.codehilite {
 	border-radius: 5px;
 	}
 
+
 code, pre {
 	font-family: monospace;
 	background-color: rgb(238, 238, 238);
 }
 
+/*sub and sup stolen from Twitter bootstrap.*/
+sub,
+sup {
+	position: relative;
+	font-size: 75%;
+	line-height: 0;
+	vertical-align: baseline;
+}
+
+sup {
+	top: -0.5em;
+}
+
+sub {
+	bottom: -0.25em;
+}
+
 .post pre, .page pre {
 	padding: .5em;
 	font-size: 12px;