var gulp = require('gulp'), replace = require('gulp-replace'); const css = ` body{ font-family: "HiraMinProN-W3", "@MS 明朝", serif, sans-serif; writing-mode: vertical-rl; -webkit-writing-mode: vertical-rl; -epub-writing-mode: vertical-rl; line-height: 1.75em; text-align: justify; margin:0; padding:0; font-size:1em; } body.vertical { writing-mode: vertical-rl; -webkit-writing-mode: vertical-rl; -epu