架構頁檔案設定：
<body style="background-color:transparent" > 或 <body bgColor="transparent">
方法一：
<iframe src="about.htm" width="100%" height="100%" align="center" scrolling="auto" frameborder="0" style="filter:chroma(color=#ffffff)" >
</iframe>
缺點：iFrame裡的白色的都變透明了。
方法二：（個人推薦使用）
<iframe src="about.htm" width="100%" height="100%" align="center" scrolling="auto" frameborder="0" allowTransparency="true" >
</iframe>
還有其它幾個寫法，可以比較一下：
<iframe src="about.htm" allowTransparency="true" style="background-color: green"> </iframe >
<iframe src="about.htm"> </iframe >
<iframe src="about.htm" style="background-color: green"> </iframe >
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