diff --git a/themes/typing/source/css/typing.css b/themes/typing/source/css/typing.css
index b1f4aaa..e152163 100644
--- a/themes/typing/source/css/typing.css
+++ b/themes/typing/source/css/typing.css
@@ -622,11 +622,11 @@ blockquote {
 .dark .container,
 .dark .footer {
   color: #e6e6e6;
-  background: #000;
+  background: black;
 }
 
 .dark a:hover {
-  color: #fff;
+  color: white;
 }
 
 .dark .home a {
@@ -634,7 +634,7 @@ blockquote {
 }
 
 .dark .home a:hover {
-  border-bottom: 1px solid #fff;
+  border-bottom: 1px solid white;
 }
 
 .dark code,
@@ -869,6 +869,11 @@ svg#link {
   border-bottom: none;
 }
 
+/* underline link icon when hover */
+.article .article-entry a.headerlink:hover {
+  border-bottom: 1px solid #1abc9c;
+}
+
 @media (max-width: 768px) {
   body {
     font-size: 1.2em;