fix(style): change the background color

doc/changelog.d/746.fixed.md

@@ -0,0 +1 @@
+Change the  background color

doc/source/conf.py

@@ -97,9 +97,9 @@
     "sphinx.ext.intersphinx",
     "sphinx.ext.todo",
     "sphinx_copybutton",
-    "sphinx.ext.intersphinx",
     "notfound.extension",
     "sphinx_jinja",
+    "sphinx.ext.mathjax",
 ]
 
 # Intersphinx mapping

src/ansys_sphinx_theme/assets/styles/nbsphinx.scss

@@ -9,4 +9,25 @@
   > p.caption {
     display: none;
   }
+}
+
+/*
+ * Override the default CSS for code blocks in nbsphinx.
+ * This is required to ensure that the code blocks are displayed correctly
+ * in the nbsphinx extension.
+ */
+div.nboutput.container div.output_area .highlight,
+div.nboutput.container div.output_area .highlight pre{
+  background-color: var(--pst-color-background);
+}
+
+/*
+ * Override the default CSS for math blocks in nbsphinx.
+ * This is required to ensure that the math blocks are displayed correctly
+ * in the nbsphinx extension.
+ * otherwise, the math blocks are displayed in a reverse order.
+ */
+
+div.math {
+  flex-direction: row;
 }