我想将盒子平铺成如下图所示，
所有的盒子都具有相同的宽度和高度，接受其中一个我需要在某些情况下将其高度更改为 500px。但我不能让它正确！
http://rokhsanafiaz.co.uk/dump/1.php
这是我的CSS，
* {
margin: 0;
padding: 0;
}
h1,h2,h3,h4,h5,h6,pre,code,address,caption,cite,code,th {
font-size: 1em;
font-weight: normal;
font-style: normal;
}
ul,ol,li {
list-style: none;
margin:0px;
padding:0px;
}
fieldset,img {
border: none;
padding:0px;
margin:0px;
float:left; /** a must so that there is no extra gap at the bottom of each image **/
}
div {
clear:both;
border:1px solid #0066FF;
overflow:hidden;
}
#main {
width:785px;
/**height:837px; a must for IE, to be handled in jquery **/
position:relative !important; /** essential for sticking #company at bottom **/
border:1px solid #000;
}
#main div {
clear:none;
}
.item-global {
width:335px;
height:146px;
background:#ffffff;
padding:15px;
position:relative;
float:left;
margin: 0px 15px 15px 0px;
}
.item-global h3 {
border:0px solid #000;
margin:0px 0px 5px 0px;
}
.item-global h3 a{
font-size:20px;
color:#0099cc;
}
.item-global p{
margin:0px;
padding:0px;
font-size:14px;
line-height:18px;
clear:both;
}
.item-global-current {
height:400px;
}
和我的标记，
<!-- item-global -->
<div class="item-global round-corner">
<h3><a href="#">Topic 1</a></h3>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy</p>
<a href="#" class="button-plus"><span>more</span></a>
</div>
<!-- item-global -->
<!-- item-global -->
<div class="item-global round-corner item-global-current" style="float:none; clear:none;">
<h3><a href="#">Topic 2</a></h3>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy</p>
<a href="#" class="button-top-minus"><span>less</span></a>
<a href="#" class="button-bottom-minus"><span>less</span></a>
</div>
<!-- item-global -->
<!-- item-global -->
<div class="item-global round-corner">
<h3><a href="#">Topic 3</a></h3>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy</p>
<a href="#" class="button-plus"><span>more</span></a>
</div>
<!-- item-global -->
<!-- item-global -->
<div class="item-global round-corner">
<h3><a href="#">Topic 4</a></h3>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy</p>
<a href="#" class="button-plus"><span>more</span></a>
</div>
<!-- item-global -->
<!-- item-global -->
<div class="item-global round-corner">
<h3><a href="#">Topic 5</a></h3>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy</p>
<a href="#" class="button-plus"><span>more</span></a>
</div>
<!-- item-global -->
<!-- item-global -->
<div class="item-global round-corner">
<h3><a href="#">Topic 6</a></h3>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy</p>
<a href="#" class="button-plus"><span>more</span></a>
</div>
<!-- item-global -->
如果您知道技巧，那就太棒了！谢谢！