diff --git a/doc/assets/style.css b/doc/assets/style.css
index b884d23..344be53 100644
--- a/doc/assets/style.css
+++ b/doc/assets/style.css
@@ -276,4 +276,24 @@ a:hover{
 
 form.search-form {
     display: contents;
+}
+
+td.hljs-ln-numbers {
+	-webkit-touch-callout: none;
+	-webkit-user-select: none;
+	-khtml-user-select: none;
+	-moz-user-select: none;
+	-ms-user-select: none;
+	user-select: none;
+
+	text-align: center;
+	color: #ccc;
+	vertical-align: top;
+    font-size: 13;
+	/* your custom style here */
+}
+
+/* for block of code */
+#container .blogentry .hljs-ln td.hljs-ln-code {
+	padding-left: 10px;
 }
\ No newline at end of file