added relative path in build folder creation

build.js

@@ -47,14 +47,14 @@ files.forEach( file => {
 });
 
 fs.cp('./src/styles','./build/styles', { recursive: true }, (err) => {
- 	if (err) throw err;
+	if (err) throw err;
 });
 
 
 function ensureDirectoryExists(filePath) {
     var dirname = filePath.split('/').slice(0,-1).join('/');
-    if (fs.existsSync(dirname)) {
-		return true;
+    if (fs.existsSync("./" + dirname)) {
+	return true;
     }
     ensureDirectoryExists(dirname);
     fs.mkdirSync(dirname);