diff --git a/docs/_static/css/custom.css b/docs/_static/css/custom.css
new file mode 100644
index 00000000..d7c2f164
--- /dev/null
+++ b/docs/_static/css/custom.css
@@ -0,0 +1,3 @@
+a.external {
+    overflow-wrap: anywhere;
+}
diff --git a/docs/conf.py b/docs/conf.py
index 5e0bb328..b273afca 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -99,6 +99,11 @@ html_theme = "sphinx_rtd_theme"
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ["_static"]
 
+html_css_files = [
+    "css/custom.css",
+]
+
+
 # Custom sidebar templates, must be a dictionary that maps document names
 # to template names.
 #