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css：

代碼如下:

*{margin:0;padding:0;list-style-type:none;}

a,img{border:0;}

body{font:12px/180% Arial, Helvetica, sans-serif, "新宋體";}

/* demo */

.demo{width:800px;margin:0 auto;}

.demo div{margin:40px 0 0 0;}

html：

代碼如下:

<div class="demo">

<div>

<iframe name="weather_inc" src="" width="650" height="70" frameborder="0" marginwidth="0" marginheight="0" scrolling="no"></iframe>

</div>

<div>

<iframe name="weather_inc" src="" style="border:solid 1px red" width="225" height="90" frameborder="0" marginwidth="0" marginheight="0" scrolling="no"></iframe>

</div>

<div>

<iframe name="weather_inc" src="" width="800" height="60" frameborder="0" marginwidth="0" marginheight="0" scrolling="no"></iframe>

</div>

<div>

<iframe name="weather_inc" src="" width="500" height="15" frameborder="0"></iframe>

</div>

<div>

<iframe name="weather_inc" src="" width="650" height="221" frameborder="0" marginwidth="0" marginheight="0" scrolling="no"></iframe>

</div>

<div>

<iframe name="weather_inc" src="" width="800" height="120" frameborder="0" marginwidth="0" marginheight="0" scrolling="no"></iframe>

</div>

</div>

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