diff --git a/browser/themes/shared/searchbar.inc.css b/browser/themes/shared/searchbar.inc.css
index ae7716b4471d..77a407a1ecbf 100644
--- a/browser/themes/shared/searchbar.inc.css
+++ b/browser/themes/shared/searchbar.inc.css
@@ -67,6 +67,8 @@
 .searchbar-engine-one-off-item {
   appearance: none;
   display: inline-block;
+  background-color: transparent;
+  border: none;
   min-width: 32px;
   height: 32px;
   margin-inline-end: 8px;
diff --git a/browser/themes/windows/searchbar.css b/browser/themes/windows/searchbar.css
index 617a1ac69f0e..f0b8c0a50bdc 100644
--- a/browser/themes/windows/searchbar.css
+++ b/browser/themes/windows/searchbar.css
@@ -4,11 +4,11 @@
 
 %include ../shared/searchbar.inc.css
 
-.searchbar-engine-one-off-item:-moz-focusring {
+.searchbar-engine-one-off-item:focus-visible {
   outline: none;
 }
 
-@media (-moz-proton) and (-moz-os-version: windows-win10) {
+@media (-moz-os-version: windows-win10) {
   #PopupSearchAutoComplete {
     /* A border is necessary because the shadow is bottom-right */
     border-color: var(--menu-border-color);