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html 居中的內容顯示框

 

 

<!doctype html>
<html lang="en">
 <head>
  <meta charset="UTF-8">
  <meta name="Generator" content="EditPlus®">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
  <title>Document</title>
  <style>
    html,body
    {
        height: 100%;
        overflow: hidden;
    }
    body,div,h2{
        margin: 0;

    }
    center{
        padding-top: 10px;
    }
    button{
        cursor: pointer;
    }
    #outer{
        position: fixed;
        top: 0;
        left: 0;
        width: 5%;
        height: 100%;
        background: #000;
        opacity: 0.5;
        filter:alpha(opacity=50);
        display: block;
    }
    #windows{
        position: absolute;
        top: 50%;
        left: 50%;
        width: 50%;
        height: 45%;
        background: #fff;
        border: 4px solid #F90;
        overflow: hidden;
        transform: translate3d(-50%, -50%, 0);
        display: block;
    }
    h2{
        text-align: right;
        background: #FC0;
        border-bottom: 3px solid #F90;
    }
    h2 span{
        color: #F90;
        cursor: pointer;
        background: #FFF;
        border: 1px solid #F90;
        padding: 0 2px;
    }
    p{
        text-align: justify;
        text-indent: 2em;
    }
</style>
 
 </head>
 <body>
<div id="windows">
    <h2>title<span id="close">*</span></h2>
    <p>測試平臺測試平臺測試平臺測試平臺測試平臺測試測試平臺</p>
</div>
 </body>
</html>