diff --git a/docs/_assets/css/color-brewer.css b/docs/_assets/css/color-brewer.css
deleted file mode 100644
index b832a05ebc51..000000000000
--- a/docs/_assets/css/color-brewer.css
+++ /dev/null
@@ -1,66 +0,0 @@
-/*
-
-Colorbrewer theme
-Original: https://github.com/mbostock/colorbrewer-theme (c) Mike Bostock <mike@ocks.org>
-Ported by Fabrício Tavares de Oliveira
-
-*/
-
-/* .hljs {
-  background: transparent;
-}
-
-.hljs,
-.hljs-subst {
-  color: #000;
-} */
-
-/*.hljs-string,
-.hljs-meta,
-.hljs-symbol,
-.hljs-template-tag,
-.hljs-template-variable,
-.hljs-addition {
-  color: #756bb1;
-}*/
-
-/* .hljs-comment,
-.hljs-quote {
-  color: #636363;
-}
-
-.hljs-number,
-.hljs-regexp,
-.hljs-literal,
-.hljs-bullet,
-.hljs-link {
-  color: #31a354;
-}
-
-.hljs-deletion,
-.hljs-variable {
-  color: #88f;
-} */
-
-/*.hljs-keyword,
-.hljs-selector-tag,
-.hljs-title,
-.hljs-section,
-.hljs-built_in,
-.hljs-doctag,
-.hljs-type,
-.hljs-tag,
-.hljs-name,
-.hljs-selector-id,
-.hljs-selector-class,
-.hljs-strong {
-  color: #3182bd;
-}*/
-
-/* .hljs-emphasis {
-  font-style: italic;
-}
-
-.hljs-attribute {
-  color: #e6550d;
-} */
diff --git a/docs/_layouts/base.html b/docs/_layouts/base.html
index 62823d08c751..feb79d1590a0 100644
--- a/docs/_layouts/base.html
+++ b/docs/_layouts/base.html
@@ -1,7 +1,3 @@
----
-extraCSS:
-    - css/color-brewer.css
----
 <link rel="dns-prefetch" href="//fonts.googleapis.com">
 <link rel="preconnect" href="https://cdnjs.cloudflare.com" crossorigin>
 <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>