diff --git a/style.css b/style.css
index 9396a27..2b86f00 100644
--- a/style.css
+++ b/style.css
@@ -32,6 +32,14 @@ ul.links {
   display: inline;
 }
 
+#link_menu li a img:hover {
+  filter: brightness(80%);
+}
+
+#link_menu li a img {
+  filter: brightness(100%);
+}
+
 div.center {
   align-items: center;
   align-content: center;