Fixes #371

[LostAttractor]

Fixes #371

发现箭头不居中为font-size: 1.75rem;属性所致，去除即恢复正常
所以给了个left: -0.875rem解决

不过虽然箭头是这样对齐了，但是这个div还是没对齐，鄙人不是做前端的不是很懂CSS，不过推测是因为居中的实现方法是left:50%，但我也不知道应该怎么居中好（

居中问题的话，通过在lower-container的css增加position: absolute;解决了，halo1的版本中是有这个修饰的

此外，我没有npm run build，我构建会失败

[vite]: Rollup failed to resolve import "APlayer" from "/home/lostattractor/Documents/GitHub/halo-theme-sakura/src/module/utils.ts".
This is most likely unintended because it can break your application at runtime.
If you do want to externalize this module explicitly add it to
`build.rollupOptions.external`
error during build:
Error: [vite]: Rollup failed to resolve import "APlayer" from "/home/lostattractor/Documents/GitHub/halo-theme-sakura/src/module/utils.ts".
This is most likely unintended because it can break your application at runtime.
If you do want to externalize this module explicitly add it to
`build.rollupOptions.external`
    at viteWarn (file:///home/lostattractor/Documents/GitHub/halo-theme-sakura/node_modules/vite/dist/node/chunks/dep-abb4f102.js:48051:27)
    at onRollupWarning (file:///home/lostattractor/Documents/GitHub/halo-theme-sakura/node_modules/vite/dist/node/chunks/dep-abb4f102.js:48083:9)
    at onwarn (file:///home/lostattractor/Documents/GitHub/halo-theme-sakura/node_modules/vite/dist/node/chunks/dep-abb4f102.js:47814:13)
    at file:///home/lostattractor/Documents/GitHub/halo-theme-sakura/node_modules/rollup/dist/es/shared/node-entry.js:24070:13
    at Object.logger [as onLog] (file:///home/lostattractor/Documents/GitHub/halo-theme-sakura/node_modules/rollup/dist/es/shared/node-entry.js:25742:9)
    at ModuleLoader.handleInvalidResolvedId (file:///home/lostattractor/Documents/GitHub/halo-theme-sakura/node_modules/rollup/dist/es/shared/node-entry.js:24656:26)
    at ModuleLoader.resolveDynamicImport (file:///home/lostattractor/Documents/GitHub/halo-theme-sakura/node_modules/rollup/dist/es/shared/node-entry.js:24714:58)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async file:///home/lostattractor/Documents/GitHub/halo-theme-sakura/node_modules/rollup/dist/es/shared/node-entry.js:24601:32

根据提示在build.rollupOptions.external增加APlayer和APlayer/dist/APlayer.min.css?used后可以构建了但是构建出来的/assets/dist/就会没有aplayer的js和css，不知道正确应该是怎么构建的，请教一下，到时候我补上
此外，构建也可以加个ci（

[LIlGG]

是否使用了 pnpm install 进行依赖包下载？后续会增加 ci 进行构建

[LIlGG]

目前也缺少关于开发的文档，找机会我会补充一下。

[LostAttractor]

是否使用了 pnpm install 进行依赖包下载？后续会增加 ci 进行构建

是的，npm和pnpm我都试了，都不行
不确定和我在用NixOS有没有什么关系，Nix的环境比较怪

[LIlGG]

我已经解决了 npm 构建失败的问题并增加了 github actions 进行 ci 构建，你可以重新拉取一下最新的代码。

[LIlGG]

非常完美，它能够正常工作并且符合预期，感谢提供的 PR。