Gulp browser says Cannot get /

I am using gulp.The tasks are getting run creating required folders. But I get Cannot GET/ error when run in browser.I have attached the image of my project structure and also the output in

Gulp

File structure

Problem(Cannot get/)

My index.html contains the following:

<!DOCTYPE html>
<html class="no-js" lang="en">
    <head>
        <title>Bootstrap 4 Layout</title>
        <meta http-equiv="x-ua-compatible" content="ie=edge">
      <meta name="viewport" content="width=device-width, initial-scale=1.0" />

        <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Raleway:400,800">
        <link rel='stylesheet' href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
        <link rel="stylesheet" href="/css/bootstrap.css">
        <link rel="stylesheet" href="/css/styles.css">
    </head>

    <body>
        <script src="/js/jquery.min.js"></script>
        <script src="/js/popper.min.js"></script>
        <script src="/js/bootstrap.min.js"></script>
    </body>
</html>

Following is my gulpfile.js

var gulp        = require('gulp');
var browserSync = require('browser-sync').create();
var sass        = require('gulp-sass');

// Compile sass into CSS & auto-inject into browsers
gulp.task('sass', function() {
    return gulp.src(['node_modules/bootstrap/scss/bootstrap.scss', 'src/scss/*.scss'])
        .pipe(sass())
        .pipe(gulp.dest("src/css"))
        .pipe(browserSync.stream());
});

// Move the javascript files into our /src/js folder
gulp.task('js', function() {
    return gulp.src(['node_modules/bootstrap/dist/js/bootstrap.min.js', 'node_modules/jquery/dist/jquery.min.js', 'node_modules/popper.js/dist/umd/popper.min.js'])
        .pipe(gulp.dest("src/js"))
        .pipe(browserSync.stream());
});

// Static Server + watching scss/html files
gulp.task('serve', ['sass'], function() {

    browserSync.init({
        server: "./src"  
    });

    gulp.watch(['node_modules/bootstrap/scss/bootstrap.scss', 'src/scss/*.scss'], ['sass']);
    gulp.watch("src/*.html").on('change', browserSync.reload);
});

gulp.task('default', ['js','serve']);

I fixed it! Just put the index.html inside the src folder and rename the file style.css to "styles.css". Good luck!