Create separate sourcemaps file and not include into main.css

gulpfile.js

@@ -8,7 +8,7 @@ gulp.task('sass', function () {
     return gulp.src('./src/main.scss')
         .pipe(sourcemaps.init())
         .pipe(sass().on('error', sass.logError))
-        .pipe(sourcemaps.write())
+        .pipe(sourcemaps.write('.'))
         .pipe(gulp.dest('./static/styles'));
 });