https://blog.gongquiz.com/2022/11/11/%eb%8b%a4%ec%9d%8c-%ec%a0%9c%ec%96%b4%eb%b0%a9%ec%8b%9d-%ec%a4%91-%ec%9e%94%eb%a5%98%ed%8e%b8%ec%b0%a8off-set%eb%a5%bc-%ec%a0%9c%ea%b1%b0%ed%95%98%ec%97%ac-%ec%9d%91%eb%8b%b5%ec%8b%9c%ea%b0%84/