div x內mutilple divs不能擴展其高度指定％？

我有一個側邊欄有很多嵌套的div來放置我的圓角corrners.but當我試圖設置內容的div高度等於90％，它不擴展。什麼是問題。我的html，身體有100％height.my div巢是這樣的一些東西。div x內mutilple divs不能擴展其高度指定％？

<body> 
<div class="main">    //it contains header n content div,its height is 90% 
<div class="header"></div>  //its height is 10% of main div 
<div class="content">    //its height is 90% of main div 

<div class="vertical_navigation"> //its height is 99% of content div 

<div><div><div><div>    //thses divs are for rounded corner image concept 
<div> </div>      //this div contains the data.now its height is 80% but its not expanding?h 
            //i cant use min-height,its not working too.how to give height referenced to        //vertical navi div?? 
</div></div></div></div> 

</div> 

</div> 

</div> 
<footer></footer> 
</body>

來源

2011-01-21 Aakash Sahai

嘗試發佈您的*實際* HTML和CSS，而不是討論它「有點」。另外，歡迎來到Stackoverflow！ =） – 2011-01-21 07:26:07