diff --git a/web/style.css b/web/style.css
index 5105f17..63cd079 100644
--- a/web/style.css
+++ b/web/style.css
@@ -2054,10 +2054,10 @@ h1 {
 .bookmark-subpage__filter-toggle {
   width: 22px;
   height: 22px;
-  border: 1px solid #cbd5e1;
+  border: none;
   border-radius: 4px;
-  background: #fff;
-  color: #475569;
+  background: transparent;
+  color: #94a3b8;
   display: inline-flex;
   align-items: center;
   justify-content: center;
@@ -2072,14 +2072,22 @@ h1 {
 }
 
 .bookmark-subpage__filter-toggle:hover {
-  color: #1f2937;
-  border-color: #94a3b8;
+  color: #64748b;
+}
+
+.bookmark-subpage__filter-toggle:focus-visible {
+  outline: 2px solid #93c5fd;
+  outline-offset: 1px;
 }
 
-.bookmark-subpage__filter-toggle.is-open,
 .bookmark-subpage__filter-toggle.is-active {
   color: #0f4bb8;
+}
+
+.bookmark-subpage__filter-toggle.is-open {
   border-color: #60a5fa;
+  border-style: solid;
+  border-width: 1px;
   background: #eff6ff;
 }