Improve UI Focus Consistency

src/styles.scss

@@ -1,3 +1,6 @@
+@use "sass:list";
+@use "styles/library" as library;
+
 @import url('https://cdn.jsdelivr.net/npm/nanumsquareneo@0.0.5/nanumsquareneo.css');
 @import url('https://cdn.jsdelivr.net/gh/wanteddev/wanted-sans@v1.0.1/packages/wanted-sans/fonts/webfonts/variable/split/WantedSansVariable.min.css');
 @import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard-jp-dynamic-subset.min.css");
@@ -76,3 +79,8 @@ section.feature-block {
   max-width: 600px;
   margin: 0 auto;
 }
+
+*:focus-visible {
+  outline: 2px solid list.nth(library.$brand_palette, 5);
+  outline-offset: 2px;
+}