diff --git a/src/_includes/icons/proton.liquid b/src/_includes/icons/proton.liquid
index 3ccaff4a..fabbd3fd 100644
--- a/src/_includes/icons/proton.liquid
+++ b/src/_includes/icons/proton.liquid
@@ -4,6 +4,7 @@
     rel="me"
     title="Proton Mail">
     <svg
+      class="inline w-6 h-6 fill-current text-gray-700 hover:text-purple-500 dark:text-gray-200 dark:hover:text-purple-400"
       role="img"
       viewBox="0 0 24 24"
       xmlns="http://www.w3.org/2000/svg">