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https://codepen.io/soyeonlee57/pen/KKWJGBW

1단계

1단계

 

https://codepen.io/soyeonlee57/pen/BaWMqPo

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2단계

 

https://codepen.io/soyeonlee57/pen/abJXRMR

3단계

3단계

 

https://codepen.io/soyeonlee57/pen/WNpPYbO

4단계

 

4단계