… Selecting font size can be daunting. But there is a technique that can help you — a modular scale. A modular scale is a sequence of values that can be applied to determine the size of your text styles in a harmonious way. You first choose a ratio — For example, the golden mean 1:1.618 (scale factor). Then you pick the base size of your text, for example, 16px. After that, you multiply to get the sequential numbers: 16px, 26px, 42px, 68px, 110px. You can use a tool like Gridlover to find a proper font size for different scale ratios.