diff --git a/packages/jupyter-ai/style/rendermime-markdown.css b/packages/jupyter-ai/style/rendermime-markdown.css
index bdf375bff..177bfbe2c 100644
--- a/packages/jupyter-ai/style/rendermime-markdown.css
+++ b/packages/jupyter-ai/style/rendermime-markdown.css
@@ -1,38 +1,4 @@
-/* ************************************** */
-
-/*
- * Styles below are for JupyterLab >=4.0.0,<4.3.0.
- */
-
-/* ************************************** */
-
-.jp-ai-rendermime-markdown .jp-RenderedHTMLCommon {
-  padding-right: 0;
-}
-
-.jp-ai-rendermime-markdown pre {
-  background-color: var(--jp-cell-editor-background);
-  overflow-x: auto;
-  white-space: pre;
-  margin: 0;
-  padding: 4px 2px 0 6px;
-  border: var(--jp-border-width) solid var(--jp-cell-editor-border-color);
-}
-
-.jp-ai-rendermime-markdown pre > code {
-  background-color: inherit;
-  overflow-x: inherit;
-  white-space: inherit;
-}
-
-.jp-ai-rendermime-markdown mjx-container {
-  font-size: 119%;
-}
-
-/* ************************************** */
-
 /*
- * Styles below are for JupyterLab >=4.3.0.
  *
  * Selectors must be nested in `.jp-ThemedContainer` to have a higher
  * specificity than selectors in rules provided by JupyterLab.
@@ -41,8 +7,6 @@
  * See also: https://github.com/jupyterlab/jupyter-ai/issues/1090
  */
 
-/* ************************************** */
-
 .jp-ThemedContainer .jp-ai-rendermime-markdown .jp-RenderedHTMLCommon {
   padding-right: 0;
 }