Accessibility course: Establish something so that the user can choose between 4 contrast settings

Good morning, we are developing a accessibility course for blind and hear problems people and we fond this barrier that we assume it’s necessary touch code. Someone knows how to do it?

Establish something so that the user can choose between 4 contrast settings (according to the settings Windows allows) - these settings will be necessary only within the section of the text-based course

Here you can find the actual HTML document:
https://www.dropbox.com/sh/6z7cm20rbfbxkvf/AACbokEs_CfY9OwmcgePsAIta?dl=0

Thank you very much for your support,

Best,

César

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