diff --git a/website/src/css/custom.css b/website/src/css/custom.css
index a9d1a10..b7b34ef 100644
--- a/website/src/css/custom.css
+++ b/website/src/css/custom.css
@@ -14,6 +14,7 @@
   --ifm-color-primary-lighter: #ffaeb2;
   --ifm-color-primary-lightest: #ffd1d3;
   --ifm-code-font-size: 95%;
+  --docusaurus-highlighted-code-line-bg: lightgray;
 }
 
 /* For readability concerns, you should choose a lighter palette in dark mode. */
@@ -25,6 +26,7 @@ html[data-theme='dark'] {
   --ifm-color-primary-light: #ff858b;
   --ifm-color-primary-lighter: #ffaeb2;
   --ifm-color-primary-lightest: #ffd1d3;
+  --docusaurus-highlighted-code-line-bg: darkslategray;
 }
 
 .footer {