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                            [TOC]
## box-shadow
> 水平 垂直 陰影程度 大小 顏色
## .bootstrap的單位
```
xs - sm - md - lg

768  - 992 - 1200
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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