css - boxes adding up to 100% of the browser -

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i want have 2 boxes right next each other, 1 fixed width, , width change based on size of browser. box has overflow:auto, , i'm trying first box act side bar follow down page. of course can't seem achieve this, , have come here hoping give me examples, or point me in right direction.

thanks!

to achieve layout asked try along these lines:

html:

<div>     <div id="col1">left navigation menu</div>     <div id="col2">right content</div> </div>

css:

#col1 {     position:fixed;     width:400px; }  #col2 {     position:absolute;     left:400px; }

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