fix : 디자인을 수정함 black=> white

[GiPyoo]

Description and Motivation

• 전반적인 디자인을 블랙에서 화이트로 변경하였음
• 매직넘버 컬러코드를 대부분 변수화함

Types of changes

• [ ] Docs change
• [ ] dependency upgrade
• [ ] refactoring
• [ ] Bug fix
• [ ] New feature
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Review

Checklist

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.