remove the leading indent of code element (#42)

static/less/style.less

@@ -114,6 +114,7 @@ pre {
 }
 
 code {
+  display: inline-block;
   background-color: @darker-fg-color;
   color: @bg-color;
   padding: 0.4rem 0.8rem 0.4rem 0.8rem;