diff --git a/sphinx/themes/basic/static/basic.css_t b/sphinx/themes/basic/static/basic.css_t
index 08a3ad980..72864bffd 100644
--- a/sphinx/themes/basic/static/basic.css_t
+++ b/sphinx/themes/basic/static/basic.css_t
@@ -673,9 +673,14 @@ table.highlighttable td.linenos {
 }
 
 table.highlighttable td.code {
+    flex: 1;
     overflow: hidden;
 }
 
+.highlight .hll {
+    display: block;
+}
+
 table.highlighttable pre {
     margin: 0;
 }