diff --git a/package-lock.json b/package-lock.json
index 5c6e49b..a4243ab 100644
Binary files a/package-lock.json and b/package-lock.json differ
diff --git a/package.json b/package.json
index 0fae4a4..8d14879 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@fwdekker/template",
-    "version": "3.1.0",
+    "version": "3.1.1",
     "description": "The base template for pages on fwdekker.com.",
     "author": "Florine W. Dekker",
     "license": "MIT",
diff --git a/src/main/css/snippets/common.css b/src/main/css/snippets/common.css
index e313e3a..01a04dd 100644
--- a/src/main/css/snippets/common.css
+++ b/src/main/css/snippets/common.css
@@ -7,7 +7,10 @@ a[target="_blank"]::after {
     margin-left: 0.25rem;
 
     /* Image from https://icons.getbootstrap.com/icons/box-arrow-up-right/. MIT License. */
-    mask-image: url("data:image/svg+xml,%3C%3Fxml version='1.0' encoding='UTF-8'%3F%3E%3Csvg fill='currentColor' viewBox='0 0 16 16' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M8.636 3.5a.5.5 0 0 0-.5-.5H1.5A1.5 1.5 0 0 0 0 4.5v10A1.5 1.5 0 0 0 1.5 16h10a1.5 1.5 0 0 0 1.5-1.5V7.864a.5.5 0 0 0-1 0V14.5a.5.5 0 0 1-.5.5h-10a.5.5 0 0 1-.5-.5v-10a.5.5 0 0 1 .5-.5h6.636a.5.5 0 0 0 .5-.5z' fill-rule='evenodd'/%3E%3Cpath d='M16 .5a.5.5 0 0 0-.5-.5h-5a.5.5 0 0 0 0 1h3.793L6.146 9.146a.5.5 0 1 0 .708.708L15 1.707V5.5a.5.5 0 0 0 1 0v-5z' fill-rule='evenodd'/%3E%3C/svg%3E%0A");
+    --mask-image: url("data:image/svg+xml,%3C%3Fxml version='1.0' encoding='UTF-8'%3F%3E%3Csvg fill='currentColor' viewBox='0 0 16 16' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M8.636 3.5a.5.5 0 0 0-.5-.5H1.5A1.5 1.5 0 0 0 0 4.5v10A1.5 1.5 0 0 0 1.5 16h10a1.5 1.5 0 0 0 1.5-1.5V7.864a.5.5 0 0 0-1 0V14.5a.5.5 0 0 1-.5.5h-10a.5.5 0 0 1-.5-.5v-10a.5.5 0 0 1 .5-.5h6.636a.5.5 0 0 0 .5-.5z' fill-rule='evenodd'/%3E%3Cpath d='M16 .5a.5.5 0 0 0-.5-.5h-5a.5.5 0 0 0 0 1h3.793L6.146 9.146a.5.5 0 1 0 .708.708L15 1.707V5.5a.5.5 0 0 0 1 0v-5z' fill-rule='evenodd'/%3E%3C/svg%3E%0A");
+    -webkit-mask-image: var(--mask-image);
+    -webkit-mask-size: cover;
+    mask-image: var(--mask-image);
     mask-size: cover;
     background-repeat: no-repeat no-repeat;
     background-position: center center;