Gulp does not automatically update the page, although it starts normally, how can I fix it or what needs to be added?

Question

gulp.js

I launch the gallp, it starts, but when css changes, it does not automatically update the page, and if you change and save it, then it updates what to do so that it automatically monitors the change in the file (css, html, js ...). Here is my gulp file
// Including packages
var gulp = require('gulp');
var browserSync = require('browser-sync').create();
gulp.task('server', function() {
browserSync.init({
server: {baseDir: './src/'}
});
gulp.watch('src/**/*.html').on( 'change', browserSync.reload);
gulp.watch('src/css/**/*.css').on('change', browserSync.reload);
gulp.watch('src/js/**/ *.js').on('change', browserSync.reload);
gulp.task('default', ['server']);