diff --git a/frontend/src/styles.css b/frontend/src/styles.css
index 02bcb2d..13624b1 100644
--- a/frontend/src/styles.css
+++ b/frontend/src/styles.css
@@ -167,11 +167,20 @@ a { color: var(--primary); }
 .sidebar-collapsed .sidebar-panel-btn { display: none; }
 .sidebar-expand-overlay {
   display: none; position: absolute; inset: 0;
-  background: none; border: none; cursor: pointer;
+  background: transparent !important; border: none; cursor: pointer;
   align-items: center; justify-content: center;
-  color: var(--sidebar-text); border-radius: 0;
+  color: transparent; border-radius: 0;
+  -webkit-appearance: none; appearance: none;
+  outline: none;
 }
+.sidebar-expand-overlay:hover,
+.sidebar-expand-overlay:focus,
+.sidebar-expand-overlay:active { background: transparent !important; outline: none; }
 .sidebar-collapsed .sidebar-brand:hover .sidebar-expand-overlay { display: flex; }
+.sidebar-collapsed .sidebar-brand:hover .sidebar-brand-logo {
+  filter: brightness(1.18);
+  transition: filter .15s;
+}
 .sidebar-nav {
   flex: 1;
   overflow-y: auto;