diff --git a/src/scss/_cards.scss b/src/scss/_cards.scss
index 17928d6e2..a131c99d9 100644
--- a/src/scss/_cards.scss
+++ b/src/scss/_cards.scss
@@ -270,11 +270,14 @@ html.maximized-card {
 .btn-tool {
   --#{$prefix}btn-padding-x: .5rem;
   --#{$prefix}btn-padding-y: .25rem;
+
+  &:not(.btn-tool-custom) {
   --#{$prefix}btn-color: var(--#{$prefix}tertiary-color);
   --#{$prefix}btn-bg: transparent;
   --#{$prefix}btn-box-shadow: none;
   --#{$prefix}btn-hover-color: var(--#{$prefix}secondary-color);
   --#{$prefix}btn-active-border-color: transparent;
+  }
 
   margin: -$card-spacer-y 0;
   font-size: $font-size-sm;