Customize Google Maps Styling
Visit
https://mapstyle.withgoogle.com/
to customize the look and feel of Google Maps
https://gyazo.com/cf00f37485af1a7f84e44e26610a1562
Click Finish then source code is displayed.
Copy the code & paste into the web page.
https://gyazo.com/bdc4306b702374934ed58bbda196edc7