fix alignment of highlighted lines on alabaster

Author: akhmerov

jupyter_sphinx/css/jupyter-sphinx.css

@@ -62,6 +62,13 @@ div.jupyter_container {
     padding: 0;
     margin: 0;
 }
+
+/* Prevent alabaster breaking highlight alignment */
+div.jupyter_container .hll {
+  padding: 0;
+  margin: 0;
+}
+
 /* overrides for sphinx_rtd_theme */
 .rst-content .jupyter_container div[class^='highlight'],
 .document .jupyter_container div[class^='highlight'],