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                            Em 和 rem 單位提供的這種靈活性和工作方式都很相似
Em 和 rem 單位之間的區別是瀏覽器根據誰來轉化成px值
em相對于父元素，會產生繼承， 默認1em = 16px 像素值將是em值乘以使用em單位的元素的字體大小
rem相對于根元素 即 html 元素的字體大小  根元素字體大小乘以你 rem 值
Rem 提供一致尺寸而不是繼承
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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