Reduce indent between checkbox and label

Signed-off-by: Dmitriy Ivanko <tmwsls12@gmail.com>

src/css/markdown.scss

@@ -72,7 +72,7 @@ img {
 }
 
 input[type=checkbox] {
-	margin: 0px 10px 0px 0px;
+	margin: 0px 3px 0px 0px;
 	line-height: 10px;
 	font-size: 10px;
 	display: inline-block;