Adding new styles into external css sheet not html? -

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i beginner , have simple question - creating site html / css using dreamweaver cs4. have created html page includes divs elements want on page, , attached style sheet it. when click on new css style rule of elements, modifies html. modify css instead, css rules automatically go attached style sheet.

i appreciate advice on how this. in advance.

http://www.udel.edu/fth/webdesign/video/dreamweaver/css/dwcreateexternalcss.html

(what need @ 7:30)

when add css rule, should ask if want add "in document only" or in css.


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