diff --git a/dist/doxygen/stylesheet.css b/dist/doxygen/stylesheet.css
index 21f34435e..31ebcc685 100644
--- a/dist/doxygen/stylesheet.css
+++ b/dist/doxygen/stylesheet.css
@@ -112,7 +112,7 @@ html {
   --toc-background-color: #f4f6fa;
   --toc-border-color: #d8dfee;
   --toc-header-color: #4665a2;
-  --toc-down-arrow-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' version='1.1' height='10px' width='5px' fill='grey'><text x='0' y='5' font-size='10'>&%238595;</text></svg>");
+  --toc-down-arrow-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' version='1.1' height='10px' width='5px' fill='gray'><text x='0' y='5' font-size='10'>&%238595;</text></svg>");
 
   /** search field */
   --search-background-color: white;
@@ -163,7 +163,7 @@ html {
   --tooltip-arrow-background-color: white;
   --tooltip-border-color: rgba(150, 150, 150, 0.7);
   --tooltip-backdrop-filter: blur(3px);
-  --tooltip-doc-color: grey;
+  --tooltip-doc-color: gray;
   --tooltip-declaration-color: #006318;
   --tooltip-link-color: #4665a2;
   --tooltip-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.25);
@@ -322,7 +322,7 @@ html {
     --toc-background-color: #151e30;
     --toc-border-color: #202e4a;
     --toc-header-color: #a3b4d7;
-    --toc-down-arrow-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' version='1.1' height='10px' width='5px'><text x='0' y='5' font-size='10' fill='grey'>&%238595;</text></svg>");
+    --toc-down-arrow-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' version='1.1' height='10px' width='5px'><text x='0' y='5' font-size='10' fill='gray'>&%238595;</text></svg>");
 
     /** search field */
     --search-background-color: black;