CASCADE RULES PRIORITY
                ======================
    Users can create style sheets.
    Unusual.
    Special cases: visually impaired.
                
    1. !important rules in a user style sheet
    -
        * { font-size: 150% !important; }
        all elements are made large
        
    2.!important rules in a web page
    -
        your important rules
    
    3. normal rules in a web page
    -
    
    4. normal rules in a user style sheet
    -
    
    5. default rules in the BROWSER
    -   set baseline rules to override
        
    --------------------------------------

        If more than one rule applies to an element, use 
        the rule with the highest specificity.
    
        If specificity is equal, use the last rule.
        
        Specificity:
            1. id most important
            
            2. class, attribute selector, pseudo-class less specific

            3. element selector is least
               
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