Add the operating-system's abbreviation as a CSS-Class to the body-tag.
This plugin adds a abbreviation of the operating system (win, mac, linux, iPad, iPhone) to the body-tag. So if there's a OS-specific difference, you can easily react to it by using the css-selector (e.g. ".mac").
Next steps of this plugin: * adding a settings page * add the class to specified elements * add user-language-abbreviation to specified elements
let me know, if you wish something helpful.