diff --git a/.gitignore b/.gitignore
index 4a14de2d7e..3cfa954b36 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,6 +32,8 @@ keystone/tests/tmp/
 keystone/locale/*/LC_MESSAGES/*.mo
 .stestr/
 *.db
+# Files created by doc build
+doc/source/_static/support-matrix.css
 # Files created by releasenotes build
 releasenotes/build
 RELEASENOTES.rst
diff --git a/doc/source/_static/support-matrix.css b/doc/source/_static/support-matrix.css
deleted file mode 100644
index 968451dd2a..0000000000
--- a/doc/source/_static/support-matrix.css
+++ /dev/null
@@ -1,47 +0,0 @@
-
-.sp_feature_mandatory {
-    font-weight: bold;
-}
-
-.sp_feature_optional {
-}
-
-.sp_feature_choice {
-    font-style: italic;
-    font-weight: bold;
-}
-
-.sp_feature_condition {
-    font-style: italic;
-    font-weight: bold;
-}
-
-
-.sp_impl_complete {
-    color: rgb(0, 120, 0);
-    font-weight: normal;
-}
-
-.sp_impl_missing {
-    color: rgb(120, 0, 0);
-    font-weight: normal;
-}
-
-.sp_impl_partial {
-    color: rgb(170, 170, 0);
-    font-weight: normal;
-}
-
-.sp_impl_unknown {
-    color: rgb(170, 170, 170);
-    font-weight: normal;
-}
-
-.sp_impl_summary {
-    font-size: 2em;
-}
-
-.sp_cli {
-    font-family: monospace;
-    background-color: #F5F5F5;
-}
\ No newline at end of file