css - How do you put two divs next to each other so they fill up the available space -

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i have 2 divs, right 1 80px wide other should fill remaining space. far tried:

<!doctype html>  <html> <head>     <title>#{get 'title' /}</title>     <style type="text/css">         body {             margin: 0;             padding: 0;         }          #left {             position: relative;             margin-right: 80px;             background-color: red;         }          #right {             float: right;             position: relative;             text-align: left;             width: 80px;             background-color: yellow;         }     </style> </head> <body> <div id="left">     left </div> <div id="right">     right </div> </body> </html>

however, right box put below left box , not right it. guess because of margin. tried margin-left: -80px on right 1 doesnt seem change anything. how have change css right div in same line left div?

have right div before left.

<div id="right">     right </div> <div id="left">     left </div>

working example


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