GCal Column Colours is a accessibility chrome extension. it's a free extension , it has 382 active users since released its first version, it earns an average rating of 3.67 from 3 rated user, last update is 4078 days ago.
GCal Column Colours is a tiny nifty plugin with a single purpose: To give customised colours to your Google Calendar. This version gives your weekends a light grey background and gives the 'today' indicator some colour. Note that this is version 0.1 and may have some bugs. Future versions may be more customisable and may work for languages other than English.
You could download the latest version crx file or older version files and install it.
English.
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You could find more help information from gcal column colours support page.
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Does not work on new 2018 Google calendar
Works like a charm!