A problem occurs after using gulp to compress CSS. The file directory is as follows:

    static/
        src/
            images/
                header.png
            css/
                pages/
                    main.css
                    xxx.css
                import.css
        dist/
            

A certain style in main.css:

    .header-area {
        background: url('../../images/header.png')
    }

import.css：

   @import pages/main.css
   @import pages/xxx.css

Now compile with gulp:

    gulp.task('minifycss', function(){
        gulp.src('src/css/**/*.css')
            .pipe(cleanCss())
            .pipe(concat(import.css))
            .pipe(gulp.dest('dist/css/'))
    })

One problem that exists now is that the compiled css is all in import.css. At this time, the correct path of the url should be
url('../images/header.png'), but it is still ('../../images/header.png'), the corresponding image resource cannot be found.

, use the absolute path, url('/static/src/images/header.png') in src, but after compilation, the correct url should be url('/static/dist/images/header.png').

How to switch the URL correctly when using gulp-clean-css?

Thanks.