feat: create content layout with emotion

inertia/components/common/unstyled/unstyled_list.tsx

@@ -0,0 +1,12 @@
+import styled from '@emotion/styled';
+
+const UnstyledList = styled.ul({
+  '&, & li': {
+    listStyleType: 'none',
+    margin: 0,
+    padding: 0,
+    border: 0,
+  },
+});
+
+export default UnstyledList;