diff --git a/_layouts/default.html b/_layouts/default.html
index aa65198..49b763e 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -5,6 +5,10 @@
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <link rel="stylesheet" href="{{ '/assets/css/style.css?v=' | append: site.github.build_revision | relative_url }}">
+    <!-- Set theme-color. -->
+    <meta name="theme-color" content="#151515" />
+    <meta name="msapplication-navbutton-color" content="#151515" />
+    <meta name="apple-mobile-web-app-status-bar-style" content="#151515" />
 
 {% seo %}
   </head>