Guidelines for choosing font sizes for your website design.
According to the digital design guidelines published in Google Material Design, using too many type sizes and styles simultaneously can ruin a design. We sue a typographic scale to produce a limited set of type (font) sizes that work together optimally for readability, usability and the grid layout.
The basic set of styles are based on a typographic scale of 12, 14, 16, 20 and 34.