add all

.vitepress/theme/index.ts

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+import DefaultTheme from 'vitepress/theme'
+import './style.css'
+
+export default {
+  extends: DefaultTheme,
+}

.vitepress/theme/style.css

@@ -0,0 +1,7 @@
+:root{
+  --vp-font-family-base: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
+}
+
+.VPDoc .VPDocAsideOutline {
+  max-height: calc(100vh - 8rem);
+}