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#ss {
background-color: black;
width: 1500px;
height: 80px;
overflow-x: 0;
margin-top: -8px;
margin-left: -200px;
opacity: 0.5;
}
#as {
background-color: red;
width: 70px;
height: 40px;
}
#bd {
background-color: grey;
background-image: url("use.jpg");
}
<body id="bd">
<div id="ss">
<button id="as"> Click me </button>
</div>
</body>
按钮标签没有在div容器内工作,IDK的原因,它的工作原理股利外,但不是在它里面..
您还应该添加到您的html代码 – 2017-05-07 12:48:15