diff --git a/layouts/partials/head.html b/layouts/partials/head.html
index 9979740..d471874 100644
--- a/layouts/partials/head.html
+++ b/layouts/partials/head.html
@@ -19,12 +19,12 @@
 {{ end }}
 
 <!-- CSS -->
-<link href="https://cdnjs.cloudflare.com/ajax/libs/flag-icon-css/3.5.0/css/flag-icon.min.css" rel="stylesheet"
-    type="text/css">
+<!-- flag-icon -->
+<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/flag-icon-css/3.5.0/css/flag-icon.min.css" integrity="sha512-Cv93isQdFwaKBV+Z4X8kaVBYWHST58Xb/jVOcV9aRsGSArZsgAnFIhMpDoMDcFNoUtday1hdjn0nGp3+KZyyFw==" crossorigin="anonymous" referrerpolicy="no-referrer" />
 
 {{ $options := (dict "targetPath" "main.css" "outputStyle" "compressed" "enableSourceMap" true) }}
 {{ $style := resources.Get "scss/main.scss" | resources.ToCSS $options | resources.Fingerprint }}
-<link rel="stylesheet" href="{{ $style.RelPermalink }}">
+<link rel="stylesheet" href="{{ $style.RelPermalink }}" integrity="{{ $style.Data.Integrity }}">
 
 {{ range $val := $.Site.Params.customCSS }}
     {{ if gt (len $val) 0 }}