https://blog.gongquiz.com/2021/11/08/%eb%8d%95%ed%8a%b8%ec%9d%98-%ec%95%84%ec%8a%a4%ed%8e%99%ed%8a%b8%eb%b9%84aspect-ratio%ec%97%90-%eb%8c%80%ed%95%9c-%ec%84%a4%eb%aa%85%ec%9c%bc%eb%a1%9c-%ec%98%b3%ec%9d%80-%ea%b2%83%ec%9d%80/