diff --git a/web/src/pages/TeamMembersPage.tsx b/web/src/pages/TeamMembersPage.tsx
index bf819ad..adfd64c 100644
--- a/web/src/pages/TeamMembersPage.tsx
+++ b/web/src/pages/TeamMembersPage.tsx
@@ -304,7 +304,18 @@ export function TeamMembersPage() {
                 <select
                   value={editRole}
                   onChange={(e) => setEditRole(e.target.value as 'admin' | 'member')}
-                  style={{ width: 200, padding: '8px 12px', borderRadius: 6, border: '1px solid var(--color-border-card)', background: 'var(--color-bg-page)', color: 'var(--color-text-primary)', fontSize: 14 }}
+                  style={{
+                    width: '100%',
+                    padding: '8px 36px 8px 12px',
+                    borderRadius: 6,
+                    border: '1px solid var(--color-border-card)',
+                    background: `var(--color-bg-page) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>") no-repeat right 12px center`,
+                    color: 'var(--color-text-primary)',
+                    fontSize: 14,
+                    appearance: 'none',
+                    WebkitAppearance: 'none',
+                    MozAppearance: 'none',
+                  }}
                 >
                   <option value="member">成员</option>
                   <option value="admin">副管理员</option>