CSS3实现关闭按钮

<!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>
  .close {
    /* still bad on picking color */
   /* background: orange; */
   background-image: URL(http://icon.mobanwang.com/UploadFiles_8971/200805/20080528160821486.png);
   background-position: center;
   background-repeat: no-repeat;

    color: red;
    /* make a round button */
    border-radius: 12px;
    /* center text */
    line-height: 20px;
    text-align: center;
    height: 20px;
    width: 20px;
    font-size: 18px;
    padding: 1px;
}
/* use cross as close button */
.close::before {
   /* content: "\2716";*/
}
/* place the button on top-right */
.close {
    top: -10px;
    right: -10px;
    position: absolute;
}

.close:hover{
/*background:#000000;*/
 background-image: URL(http://icon.mobanwang.com/UploadFiles_8971/200805/20080528160817678.png);
}  
</style>
 </head>
 <body>
            <div style="height: 100px; width: 100px; border: 1px solid black; position: relative;">
    <span class="close"></span>
</div>
 </body>
</html>

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转载自anlinko.iteye.com/blog/2264746