diff --git a/_sass/_highlight-syntax.scss b/_sass/_highlight-syntax.scss
index 3889da8..c50a965 100644
--- a/_sass/_highlight-syntax.scss
+++ b/_sass/_highlight-syntax.scss
@@ -59,6 +59,10 @@
 .highlight .vi { color: #008080 } /* Name.Variable.Instance */
 .highlight .il { color: #009999 } /* Literal.Number.Integer.Long */
 
+@media (prefers-color-scheme: dark) {
+    .highlight  { width: 100%; overflow: auto; background: #202020; }
+}
+
 /* Make line numbers unselectable: excludes line numbers from copy-paste user ops */
 .highlight .lineno {-webkit-user-select: none;-moz-user-select: none; -o-user-select: none;}
 .lineno::-moz-selection {background-color: transparent;} /* Mozilla specific */