You might have sidebars throughout your site that use a cyan background, and you want to have your links contrast well with the sidebar background.

站点上可能到处都有使用青色背景的边栏，因此希望其中的链接能够在边栏背景上看得清楚。

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The first consideration is contrast: links have to be dark (or light) enough to contrast with the background color.

第一要义就是差异(对比)：链接要足够暗(或者亮)以和背景色相对照。

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Third-party products can provide additional functionality, such as a "theme" that enlarges fonts system-wide or one that provides high contrast between background and foreground.

第三方产品提供附加的功能，如放大全系统字体的“主题”，或者提供背景和前景之间高对比度的主题。

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