我想将瓷砖框看起来如下图所示,

所有的盒子都有相同的宽度和高度,接受其中一个我需要在某些场合将其高度改为500px.但我不能做对！

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 -->

如果你知道这些技巧会很棒！谢谢！

最佳答案 我认为,您可以更容易地单独声明两个列容器,而不是将所有7个元素混合在一起.
An example.

至少,这是我通常采用的原则：容器可以水平或垂直分成子容器,但不能在两个方向上分开.

<div class="column">
    <div class="normal">1</div>
    <div class="normal">3</div>
    <div class="normal">4</div>
</div>
<div class="column">
    <div class="large">2</div>
    <div class="normal">5</div>    
</div>