diff --git a/data/style.css b/data/style.css
index 3706fe6..dd54141 100644
--- a/data/style.css
+++ b/data/style.css
@@ -364,6 +364,7 @@ spinbutton.flat {
   padding: 6px;
   background: none;
   box-shadow: none;
+  background-color: alpha(@accent_bg_color, 0.15);
 }
 .color-scheme-button .content-block-image {
   margin: 0;