diff --git a/doc/source/_static/custom.css b/doc/source/_static/custom.css
index 1a7da734d7..c621c7b647 100644
--- a/doc/source/_static/custom.css
+++ b/doc/source/_static/custom.css
@@ -2,17 +2,3 @@
 .wy-table-responsive table td, .wy-table-responsive table th {
     white-space: normal;
 }
-
-
-.bd-content .sd-card .sd-card-body, .bd-content .sd-card .sd-card-footer {
-    background-color: transparent;
-}
-
-.sd-card-text {
-    font-family: var(--pst-font-family-base);
-    font-size: var(--pst-font-size-base);
-}
-
-.sd-sphinx-override .code {
-   background-color: var(--pst-color-surface);
-}
diff --git a/doc/source/operator_reference.rst b/doc/source/operator_reference.rst
index c3a06fccae..d2d8b68455 100644
--- a/doc/source/operator_reference.rst
+++ b/doc/source/operator_reference.rst
@@ -26,7 +26,7 @@ Click below to access the operators documentation.
 
             +++
             .. button-link:: OPEN
-               :color: secondary
+               :color: primary
                :expand:
                :outline:
                :click-parent: