Fix for auto mode

Author: kwankyu

src/doc/common/static/custom-jupyter-sphinx.css

@@ -91,6 +91,42 @@ body[data-theme="dark"] {
   }
 }
 
+@media (prefers-color-scheme: dark) {
+  body[data-theme="auto"] { /* the same styles with body[data-theme="dark"] */
+    .jupyter_container {
+      color: white;
+      background-color: black;
+    }
+
+    .thebelab-button {
+      color: #d0d0d0;
+      background-color: #383838;
+    }
+
+    .thebelab-button:active {
+      color: #368ce2;
+    }
+
+    #thebelab-activate-button {
+      background-color: #383838;
+    }
+
+    #thebelab-activate-button:active {
+      color: #368ce2;
+    }
+
+    .thebelab-cell .jp-OutputArea-output {
+      color: white;
+      background-color: black;
+    }
+
+    .thebelab-cell .jp-OutputArea-output pre {
+      color: white;
+      background-color: black;
+    }
+  }
+}
+