首先要定义一个基本字体系列和字体大小。
The first thing we did was to define a basic font family and font size.
需要使用一种便于大多数人阅读的基本字体大小。
A basic font size needs to be used that is readable for most people.
假设正文选择器的默认基本字体16 px变为原来的62.5%，如清单4所示。
Assume the default base font of 16px has been reduced to 62.5% for the body selector, shown in Listing 4.
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