diff --git a/mkdocs_tacc/tacc_readthedocs/css/tacc-theme/readthedocs-revert.css b/mkdocs_tacc/tacc_readthedocs/css/tacc-theme/readthedocs-revert.css
index a9f9995..714951d 100644
--- a/mkdocs_tacc/tacc_readthedocs/css/tacc-theme/readthedocs-revert.css
+++ b/mkdocs_tacc/tacc_readthedocs/css/tacc-theme/readthedocs-revert.css
@@ -1,4 +1,4 @@
 /* to undo ReadTheDocs styles for page content */
-.rst-content :not(img) {
+:where(.rst-content :not(img)) {
     all: revert;
 }