fix: The Search component matches the theme background color

[JedediahXu]

General

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• [ ] Bug fix (non-breaking change which fixes an issue)
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• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
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目前 搜索框的背景色太耀眼了（暗色主题）而且搜索边框消失了

稍微改了一下背景色：