diff --git a/docs/static/css/theme.css b/docs/static/css/theme.css
index f873d7d..fc4b1e2 100644
--- a/docs/static/css/theme.css
+++ b/docs/static/css/theme.css
@@ -13,9 +13,17 @@
 
 /* External link icon */
 .md-content a[href^="http"]:after {
-  content: "↗";
-  font-size: 0.7em;
-  opacity: 0.7;
-  margin-left: 0.1em;
+  --link-icon-svg: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 2048 2048'%3E%3Cpath d='M1792 256v640h-128V475l-851 850-90-90 850-851h-421V256h640zm-512 1007h128v529H256V640h529v128H384v896h896v-401z'/%3E%3C/svg%3E");
+
+  width: .5rem;
+  height: .5rem;
   vertical-align: super;
+
+  display: inline-block;
+  background-color: currentColor;
+  content: '';
+  -webkit-mask-image: var(--link-icon-svg);
+  mask-image: var(--link-icon-svg);
+  -webkit-mask-size: cover;
+  mask-size: cover;
 }