Inject css file to html
npm install gulp-inject-css --save-devconst gulp = require('gulp');
const injectCSS = require('gulp-inject-css');
gulp.task('inject-css', function() {
gulp.src('src/*.html')
.pipe(injectCSS())
.pipe(gulp.dest('dist'));
});In the html file, specify the relative path to css
<html>
...
<!-- inject-css css/main.css -->
...
</html>