Use titleTextStyle in options like
var options = { titleTextStyle: { color: <string>, // any HTML string color ('red', '#cc00cc') fontName: <string>, // ie 'Times New Roman' fontSize: <number>, // 12, 18 whatever you want (don't specify px) bold: <boolean>, // true or false italic: <boolean> // true of false } }
You can find the full guide to supporting Google Charts here https://developers.google.com/chart/interactive/docs
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