cgit.css: make the blob display in tree view a bit prettier

Adding some padding to the linenumbers while right-aligning them and
removing the background color makes the page more readable.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

cgit.css

@@ -237,16 +237,16 @@ table.blob {
 }
 
 table.blob td.lines {
-	margin: 0; padding: 0;
+	margin: 0; padding: 0 0 0 0.5em;
 	vertical-align: top;
 	color: black;
 }
 
 table.blob td.linenumbers {
-	margin: 0; padding: 0;
+	margin: 0; padding: 0 0.5em 0 0.5em;
 	vertical-align: top;
+	text-align: right;
 	border-right: 1px solid gray;
-	background-color: #eee;
 }
 
 table.blob pre {